document_title: List of Lucifer episodes

question_text: how many episodes of lucifer season 3 are there

text: List of Lucifer episodes

text: Series overview[edit]

text: Episodes[edit]

text: Season 1 (2016)[edit]

text:
No.overallNo. inseasonTitleDirected byWritten byOriginal air dateProd.codeUS viewers(millions)11"Pilot"Len WisemanTom KapinosJanuary 25, 2016 (2016-01-25)2760967.16[8]
Lucifer Morningstar, the retired ruler of Hell, owns a high-end night club in Los Angeles. When the pop star he tries to help is murdered in front of him by a drug dealer, he uses his powers of persuasion to assist Detective Chloe Decker in apprehending the true culprit behind the murder. All the while, he must deal with his brother, the dark-winged angel Amenadiel, who is putting pressure on him from their father to return to running Hell.
22"Lucifer, Stay. Good Devil."Nathan HopeJoe HendersonFebruary 1, 2016 (2016-02-01)4X65026.00[9]
Lucifer and Chloe work together again to solve a homicide, this time that of a movie star's son who was killed by an overeager paparazzo who frequently created volatile situations in order to get the "first scoop" on the story.
33"The Would-Be Prince of Darkness"Louis MilitoJason Ning & Jenn KaoFebruary 8, 2016 (2016-02-08)4X65105.47[10]
When a football star whom Lucifer convinced to lose his virginity is arrested for the murder of the girl with whom he had sex, Lucifer works to prove his innocence.
44"Manly Whatnots"Matt Earl BeesleyIldy ModrovichFebruary 15, 2016 (2016-02-15)4X65035.13[11]
Chloe and Lucifer investigate a missing persons case involving a girl, Lindsay Jolson, who was involved with a pick-up artist. The investigation is complicated by Lucifer's repeated attempts to seduce Chloe in an effort to better understand her. Meanwhile, Amenadiel confronts a reluctant Mazikeen about Lucifer. At Lucifer's encouragement, Chloe shoots him in the leg. To Lucifer's bewilderment, he feels pain and bleeds.
55"Sweet Kicks"Tim MathesonSheri ElwoodFebruary 22, 2016 (2016-02-22)4X65044.86[12]
Chloe begs Lucifer to help her in a case involving an artist/high-end shoe designer who was once in a street gang. In doing so, Lucifer knowingly puts himself in danger, finding it exciting to test his mortality. He and Chloe are ultimately rescued from a hostile situation by Mazikeen. Meanwhile, Amenadiel surprises Dr. Martin by showing up at her office after hours, stating he is a fellow psychotherapist, who has just moved into the office next door. The two agree to have drinks and openly discuss patients.
66"Favorite Son"David PaymerJason NingFebruary 29, 2016 (2016-02-29)4X65053.91[13]
When a warehouse is robbed and the security guard murdered, it turns out that the stolen container belongs to Lucifer. He and Chloe then work to find the culprit, which Lucifer sees as protecting his reputation in the city. Meanwhile, Lucifer continues to struggle with his identity and Amenadiel continues to try to use Dr. Martin to get to Lucifer. It is revealed that the stolen shipping container holds Lucifer's wings.
77"Wingman"Eriq La SalleAlex KatsnelsonMarch 7, 2016 (2016-03-07)4X65064.24[14]
Lucifer continues the search for his wings and turns to Amenadiel for help. Amenadiel rejects at first, so Lucifer enlists Chloe to assist him. Meanwhile, Chloe asks Dan for help in investigating the Palmetto case in the hopes that she can find something to confirm her suspicions against Malcolm, the cop who is in coma. The wings are apparently about to be sold at an auction. Lucifer goes to the auction where Amenadiel shows up to help Lucifer. Lucifer regains his wings, but burns them to anger Amenadiel and halt his own return to his former throne as the King of Hell. Whereas, Chloe and Dan find a new lead on the Palmetto case.
88"Et Tu, Doctor?"Eagle EgilssonJenn KaoMarch 14, 2016 (2016-03-14)4X65073.86[15]
Feeling reborn, Lucifer celebrates his "rebirthday" at the Lux. And Malcolm, who wakes up from his coma, also celebrates his coming back. Chloe and Lucifer investigate the murder of a controversial therapist who advocates adultery as a means of saving relationships. Meanwhile, Lucifer shoehorns his own therapist, Dr. Linda Martin, into the case in an attempt to "solve" Chloe's issue with Dan. While solving the murder case, Lucifer realizes what is happening to him. Malcolm meets Chloe to explain that whoever shot him dead clearly does not have a problem shooting cops. Chloe and Lucifer then look for Malcolm's partner but find him dead with a suicide note, while Dan mysteriously meets with Malcolm.
99"A Priest Walks into a Bar"David FrazeeChris RaffertyMarch 21, 2016 (2016-03-21)4X65083.82[16]
Lucifer and Chloe investigate when a priest asks for Lucifer's help in stopping a drug ring he believes is being headed by the counselor at a local youth center. However, a problem arises when the youth counselor is found dead and suspicion quickly falls on the priest. Meanwhile, Amenadiel meets with Malcolm to discuss the reason he brought him back from Hell, which is to kill someone.
1010"Pops"Tara Nicole WeyrAlex Katsnelson & Mike CostaMarch 28, 2016 (2016-03-28)4X65093.76[17]
Chloe and Lucifer investigate the poisoning death of the owner/chef at an upscale Mexican restaurant whom Lucifer admires. Suspicion falls on the owner's estranged son, a recovering drug addict, and the sous-chef, Anne, who would assume control of the restaurant if the son were out of the picture. The investigation is complicated by the surprise arrival of Chloe's mother, Penelope Decker, whom Lucifer also much admires. At home, Chloe and Penelope argue about Trixie, causing Trixie to run away to find Lucifer, but she ends up making friends with Mazikeen. Meanwhile, Malcolm reveals to Dan his plan to kill Lucifer, as directed by Amenadiel, and Mazikeen starts visiting Dr. Martin as a patient. Dan meets with Malcolm again saying that he could not let Malcolm kill Lucifer, so they end up fighting and Dan is knocked unconscious.
1111"St. Lucifer"Mairzee AlmasSheri Elwood & David McMillanApril 11, 2016 (2016-04-11)4X65113.44[18]
Lucifer finds doing charitable work thrilling and begins to explore it by donating to a local charity in honor of its murdered founder, Tim Dunlear. Amenadiel finds unlikely companionship. Meanwhile, Dan, held captive by Malcolm, tries to escape and warn Lucifer before Malcolm gets to him. Also, Lucifer learns something new about his mortality.
1212"#TeamLucifer"Greg BeemanIldy ModrovichApril 18, 2016 (2016-04-18)4X65123.81[19]
When a member of a satanic church is killed, Lucifer is greatly disturbed that anyone would kill in his name. When it turns out that Malcolm is the one killing those people to honor him, Lucifer threatens torment but then he is interrupted by Amenadiel, which allows Malcolm to run away. They start fighting each other until they are stopped by Mazikeen. Later, Chloe stops by the Lux to talk to Lucifer, but instead finds the dead body of the street preacher who was seen arguing with Lucifer on TV. Elsewhere, Lucifer's realization that Chloe makes him physically vulnerable leads to him becoming paranoid.
1313"Take Me Back to Hell"Nathan HopeJoe HendersonApril 25, 2016 (2016-04-25)4X65133.89[20]
Amenadiel saves Lucifer from being arrested by Chloe and they go to Amenadiel's office to talk. Dr. Martin shows up and advises the brothers. They go looking for Malcolm while Mazikeen helps Chloe hunt for Lucifer. Amenadiel finds Malcolm, they fight and Malcolm wounds Amenadiel with one of Mazikeen's daggers. Mazikeen saves the dying Amenadiel with the feather she kept from Lucifer's wings. Dan turns himself in clearing Lucifer of the murder. Chloe seizes Malcolm's money and he kidnaps Trixie to force her to give it back. At the exchange, Lucifer is fatally shot when he intervenes to try and save Chloe and Trixie. Lucifer prays to God offering to return to work for him if he saves Chloe. God restores Lucifer's powers and they kill Malcolm. A worried Lucifer tells Amenadiel that God has asked him to hunt for a soul who has escaped from Hell, their mother.

text: Season 2 (2016–17)[edit]

text:
No.overallNo. inseasonTitleDirected byWritten byOriginal air date [b]Prod.codeUS viewers(millions)141"Everything's Coming Up Lucifer"Nathan HopeJoe HendersonSeptember 19, 2016 (2016-09-19)T13.200514.36[21]
As Lucifer helps Chloe with a murder case involving a stand-in for a popular teen show actress, he becomes convinced that his mother's soul is occupying the body of the murderer to torment him. Lucifer tells Dr. Martin the story of how the union of his father and mother created the universe, but his mother was ultimately banished to Hell forever. Chloe tells Lucifer that she has some of his blood from the shooting and plans to test it to either prove or disprove his claims of being the devil. When Amenadiel finds out about this, he makes up a story for Chloe that portrays Lucifer as delusional, but human. Like Lucifer, Amenadiel starts to show signs of losing his angelic powers on Earth. Dan is reinstated to the police force, but gets demoted. Maze also returns from her absence, saying that she went to see a friend and wants to figure out how she fits into this world. At the end of the episode, Lucifer's mother shows up at his door, seeking help.
152"Liar, Liar, Slutty Dress on Fire"Louis MilitoIldy ModrovichOctober 3, 2016 (2016-10-03)T13.200523.67[22]
Lucifer's mother is shown awakening in her new body in pain, finding a screwdriver lodged in her neck. She explains her story to Lucifer and they return to the hotel room that she last remembers being in, finding two murdered bodies. Lucifer is convinced his mother committed the crimes and gets Chloe and Dan to investigate. Lucifer later learns that the body his mother occupies is that of Charlotte Richards, a law firm's managing partner who had been having an affair with the man she recently promoted to senior partner. Cocaine is also found hidden in Charlotte's home, giving the team more suspects. The investigation ultimately shows that Charlotte was a victim and Charlotte was not the murderer. With the crime solved, Lucifer chastises Charlotte for abandoning him when he was banished to Hell. She replies that God initially wanted to end Lucifer's existence, but she convinced God to send him to Hell instead. Lucifer seems to accept the explanation and walks away, after which Charlotte looks to the sky with a sly grin.
163"Sin-Eater"Mairzee AlmasAlex KatsnelsonOctober 10, 2016 (2016-10-10)T13.200533.67[23]
Chloe and Dan bring Lucifer in on a case involving a serial killer, whose methods of torturing victims bother Lucifer because he sees it as someone usurping his role. They find a connection to an online video-sharing company headed by Leila Simms, as the murder victims are revealed to have shot and posted videos of other people being humiliated. Back at the precinct, Chloe and Dan discuss their effect on Trixie, with Dan finally saying they need to get a divorce. Charlotte insists that Lucifer let her see her other son, Amenadiel. Although Lucifer refuses to help, Charlotte manages to speak to Amenadiel at Lux while she is there alone. Lucifer walks in on the discussion and comes to a decision on the punishment he will give his mother for escaping Hell: she will be sentenced to live among the humanity that she so despises.
174"Lady Parts"Ben BraySheri ElwoodOctober 17, 2016 (2016-10-17)T13.200543.63[24]
Chloe, Dan, and Lucifer investigate a young woman's dead body found discarded in the woods. The woman has a triangle-shaped stamp on her wrist which becomes a key clue when they find another female victim with the same stamp. With Chloe depressed over her pending divorce, Maze, Dr. Martin, and Ella take her to a bar for girls night. Chloe sees a man who has the triangle stamp on his wrist and soon learns the stamp comes from an underground sex club. They discover a man named Yuri had a connection to both victims and photos on his phone help them find the killer. Elsewhere, Charlotte struggles to adjust to her domestic life, while Amenadiel agonizes over his diminishing angelic powers. He then learns of Lucifer's deal with God: return Charlotte to Hell in exchange for sparing Chloe's life. Amenadiel says Lucifer's punishment of Charlotte does not fulfill the deal and wonders if God will take back his half of the bargain. Just then, Chloe is shown driving when a car smashes into hers.
185"Weaponizer"Karen GaviolaJason NingOctober 24, 2016 (2016-10-24)T13.200553.55[25]
Chloe's car accident is revealed to have been caused by Uriel, Lucifer's and Amenadiel's brother who has the special ability to foresee patterns. Chloe is not badly hurt and she goes right back to work, starting the case of murdered action star Wesley Cabot. Uriel tells Lucifer that the accident was a message: return Charlotte to Hell within 24 hours or Chloe will die. Lucifer visits Charlotte, telling her Uriel is a sign of God's anger and that others will come to take her to Hell if she does not go willingly. Charlotte refuses. Amenadiel and Uriel soon get in a fight. With Amenadiel's weakness and Uriel anticipating his moves, Uriel easily wins. Lucifer finally sees that Amenadiel has lost his powers. Lucifer then confronts Uriel and sees him with Azrael's dagger, acquired from the angel of death. Realizing Uriel intends to use the dagger to end Charlotte's existence permanently, Lucifer fights with his brother and loses. Maze arrives to battle with Uriel and, in the scuffle, Uriel loses hold of the dagger. Lucifer retrieves the instrument and plunges the blade into Uriel, which kills him for good, but not before he says something in Lucifer's ear.
196"Monster"Eagle EgilssonChris RaffertyOctober 31, 2016 (2016-10-31)T13.200563.42[26]
At a zombie-themed wedding, shots from an unseen source wound the groom and kill the bride. Chloe and Dan investigate and Lucifer later arrives hung over, still shaken from exterminating Uriel. Chloe reluctantly agrees to let Maze take Trixie out trick-or-treating so she can continue working the case. Maze reveals part of her true face to Trixie and Trixie thinks it is a costume. Amenadiel visits Charlotte, who praises the way he has always done what his Father asked. Amenadiel then starts to criticize God for allowing everything that has happened to the family. Chloe tracks the wedding sniper to a pharmaceutical company and Lucifer steps in front of the man's next intended victim, hoping to be shot himself. Chloe then ambushes the shooter and arrests him without incident. Lucifer visits Dr. Martin and confesses to killing his brother. He says he has always been a punisher, but never killed anyone before. As Lucifer tells the story, Dr. Martin interrupts, asking him to stop speaking in metaphors and insisting he be honest. Lucifer then reveals his true face to Dr. Martin to prove he is not lying, leaving her in a state of shock.
207"My Little Monkey"Tara Nicole WeyrJenn KaoNovember 7, 2016 (2016-11-07)T13.200573.52[27]
Chloe gets a case that hits close to home, when she learns the man convicted of killing Officer John Decker, her father, is being released from prison under supervision to attend his granddaughter's Christening. When the prisoner and his driver/guard subsequently end up murdered, Chloe and Dan reinvestigate and learn that the wrong man was in prison. During the case, Lucifer, still disgusted with himself, tries to look and act like Dan to feel more useful. Elsewhere, Dr. Martin says she has to drop Maze as a friend upon learning that she is a demon. Maze, meanwhile, is searching for a profession to fulfill her existence on earth. When she helps Chloe and the team find Deputy Warden Perry Smith, the man who ordered the killing of John Decker, Maze decides she will be a bounty hunter.
218"Trip to Stabby Town"Nathan HopeJeff LieberNovember 14, 2016 (2016-11-14)T13.200583.87[28]
Chloe, Dan, and Lucifer take on the case of a female stabbing victim, who is revealed to have been a member of a yoga group that borders on a cult. Lucifer also asks Ella for help in his own case: finding out who stole Azrael's dagger from Uriel's grave. Ella helps lead Lucifer to Charlotte's law firm. When confronted, Charlotte reveals she released the dagger into the world to get God's attention. Chloe's and Lucifer's cases cross when several members of the yoga group are found stabbed to death with Azrael's blade resting in the final victim. Dan briefly holds the blade and threatens Lucifer for ruining his family, but Dan manages to break free of the blade's hold through sheer willpower. Later, Amenadiel tells Lucifer he wants things back in their proper places with Lucifer in Hell and Charlotte in Heaven, but Charlotte says she wants her entire family back in Heaven. Lucifer says he despised living in Hell, but the thought of Heaven is even worse. He says the only place he feels respected is on Earth. Meanwhile, Lucifer resumes his sessions with Dr. Martin, who begins to realize Lucifer is like a lot of her therapy patients: a damaged individual from a dysfunctional family.
229"Homewrecker"Greg BeemanMike CostaNovember 21, 2016 (2016-11-21)T13.200593.63[29]
Chloe, Dan, and Lucifer tackle the murder of a wealthy real estate mogul who owned the entire block that includes Lux. Their investigation turns up multiple people with motives, including the victim's son, his fiancée who comes from modest means, and a rival real estate developer who wants to tear down the whole block, including Lux, to put up a shopping mall. The developer is about to get her wish until Chloe manages to get the building that houses Lux declared a historic landmark. Meanwhile, Charlotte becomes friendly with Dan and starts to strongly believe that Chloe is the reason Lucifer wants to stay on Earth. Charlotte meets with a bomb maker and plans to blow up Chloe when she steps into her car.
2310"Quid Pro Ho"Nathan HopeIldy Modrovich & Julia FontanaNovember 28, 2016 (2016-11-28)T13.200604.09[30]
Charlotte's attempt to kill Chloe is stopped by Amenadiel, who convinces her that eliminating Chloe would only cause Lucifer to be relentless in finding her killer. Lucifer later learns Charlotte tried to kill Chloe, but his thoughts soon turn to the trial of John Decker's murder, with Charlotte assigned to defend Warden Smith. Lucifer takes the stand as a witness and testifies that Chloe was first on the scene, putting a conviction at risk because Chloe provides reasonable doubt. Charlotte tries to convince Chloe to lie on the stand and paint Lucifer's testimony as false, which is the only way the warden could be convicted, but Chloe instead says Lucifer told the truth. Amenadiel later meets Chloe's mother Penelope, who is distraught over her husband's killer being set free. Amenadiel remembers meeting Penelope and John Decker 35 years ago, when he was sent by God to assist in a miracle, allowing Penelope to get pregnant. He then meets with Charlotte, telling her the story and stating that Lucifer's coming to Earth and meeting Chloe was predestined.
2411"Stewardess Interruptus"Greg BeemanSheri ElwoodJanuary 16, 2017 (2017-01-16)T13.200613.97[31]
When the only apparent connection between two murder victims is the fact that they'd once shared Lucifer's bed, Chloe interviews all of his lovers (male and female) from the past two months to try and find the culprit. Lucifer comes to the uncomfortable realization that he was never more to them than they were to him, in the process derailing his confidence in pursuing his burgeoning affections towards Chloe. Meanwhile, the actual connection in the murders is a mysterious figure for whom the victims were smuggling an unknown but deadly substance, which goes undiscovered by the police. Mazikeen continues to search for her own identity and learns a valuable truth from Dr. Linda, while Amenadiel tries to manipulate Lucifer towards Chloe at their mother's behest. In the end, Lucifer decides to stop pursuing Chloe, telling her that she is special and he is not worthy of her. His extolling of the things that make her special makes Chloe see that he has come to care for her as more than just a conquest and she kisses him.
2512"Love Handles"Karen GaviolaAlex KatsnelsonJanuary 23, 2017 (2017-01-23)T13.200624.17[32]
Lucifer is a bit confused when Chloe acts more carefree and relaxed in his presence, exchanging barbs with him. Lucifer and Chloe keep trying to track down the owner of the mysterious package after a college student is found dead due to an unknown poison. Clues lead them to Professor Carlisle, who had been chastised for saving himself and his dissertation from a burning vehicle, leaving the driver to die. Carlisle is conducting morbid "experiments" to prove all humans would make the choice he did. Meanwhile, Maze hears about Chloe's birth story from Charlotte, and agrees to meet with Lucifer to tell him the truth, in the very bar where Amenadiel met Penelope 35 years ago. As Maze changes her mind, Lucifer sees a photo of Amenadiel and a younger Penelope on the bar wall, and Charlotte confirms that Chloe is a miracle ordered by God. Lucifer goes to confront Chloe, and sees she has the symptoms of Carlisle's poison.
2613"A Good Day to Die"Alrick RileyJoe Henderson & Chris RaffertyJanuary 30, 2017 (2017-01-30)T13.200634.19[33]
Lucifer and Chloe desperately search for an antidote to save her, learning that the Professor sourced the ingredients for his poisons from an amateur artist. Chloe collapses and is hospitalized, while Dan and Lucifer learn that the formula for the antidote was known only to Carlisle. With no other options, Lucifer has Maze and Linda stop his heart, allowing him to enter Hell and find Carlisle's soul, which is now eternally tormented by a recreation of the car accident. Lucifer offers him a chance at absolution in exchange for the formula, but Carlisle fails to assuage his guilt sufficiently. While waiting to be revived, however, Lucifer stumbles upon an illusion of Uriel, who forces Lucifer to kill him again and again. Charlotte sends herself to Hell to free him, but ends up succumbing to her own guilt, forcing Lucifer to drag her away. Upon being revived, Lucifer meets up with Dan and Ella, who have retrieved the ingredients, and creates the antidote. Charlotte tries to reconnect with her son, but he disowns her for deceiving him. When Chloe visits Lux later, she is shocked to find it closed for business with Lucifer nowhere to be found.
2714"Candy Morningstar"Claudia YarmyJenn KaoMay 1, 2017 (2017-05-01)T13.200643.41[34]
Lucifer returns to Los Angeles after two weeks and introduces his wife Candy to Chloe and Dan. Chloe becomes upset, both with Lucifer's cavalier attitude and his decision to marry. When Ash Corrigan, a musician in a local band, turns up dead, Lucifer tries to help Chloe, but she pushes him away. Meanwhile, Amenadiel and Charlotte also discover that Lucifer is married and Charlotte suspects that Lucifer is planning some sort of revenge. When Maze suggests that Chloe needs a mediator, Chloe impersonates Candy as a means of getting an appointment with the mediator Ash saw for his divorce. Amenadiel confronts Lucifer for hurting Chloe's feelings. Lucifer tells him he is not trying to hurt her; rather, he is protecting her. The two discover that Doug, the drummer of Ash's band, is the murderer and take him into custody. Lucifer and Chloe agree to become partners again. It is revealed that Lucifer never married Candy, who turns out to be an actress who helped Lucifer in return for his saving her life in Las Vegas.
2815"Deceptive Little Parasite"Brad TanenbaumMike Costa & Julia FontanaMay 8, 2017 (2017-05-08)T13.200653.25[35]
Lucifer retrieves Azrael's blade, which turns out to be the Flaming Sword that once guarded Eden and can cut through the Gates of Heaven, allowing Charlotte to return home. As the Lightbringer, Lucifer is the only one who can reignite the blade, but fails to do so as it can only be triggered by extreme emotion. Chloe and Dan investigate the murder of an admissions officer at a prestigious elementary school; despite uncovering embezzlement by the assistant dean, they are unable to find any leads. Chloe and Maze pose as a married couple and attend a party in honor of the deceased, where the real murderer, a teacher whose affair was discovered by the victim, is caught and subdued by Maze. Linda suggests to Lucifer that his inability to use the blade may be because he suppresses all of the pain and heartbreak in his life and, by channeling pain instead of anger, he is able to briefly ignite the Sword. It is revealed then that Charlotte is desperate to return to Heaven because her human form is weakening.
2916"God Johnson"Sherwin ShilatiJason NingMay 15, 2017 (2017-05-15)T13.200663.05[36]
Lucifer and Chloe investigate the murder of an orderly at a mental institution. The suspect is a patient calling himself "God Johnson" who proves to be immune to Lucifer's powers and knows to call him Samael. Ella identifies the man as Earl Johnson, a businessman who was committed after giving away all his wealth. Lucifer feigns insanity to get himself committed. Upon seeing Johnson heal a woman that would have been the killer's second victim, Lucifer believes that he is God. Learning that Johnson has no knowledge of Charlotte escaping Hell, Lucifer and Linda break him out and set up a surprise date between the two. Amenadiel reveals to Maze that Lucifer is returning to Heaven, leaving her behind. Johnson and Charlotte begin to reconcile, but Chloe takes him and Lucifer back to the hospital. Lucifer and Johnson are then abducted by the real killer, one of the nurses, and make peace with one another. After being rescued, Lucifer discovers that Johnson's belt buckle was part of Azrael's Blade and that Johnson was filled with the knowledge and power of God while wearing it. Realizing that his real Father would never reconcile with him, his hatred becomes even stronger.
3017"Sympathy for the Goddess"Louis MilitoJoe HendersonMay 22, 2017 (2017-05-22)T13.200673.03[37]
Lucifer, Amenadiel, and Charlotte cut a deal with a smuggler for the last piece of the Blade. However, the smuggler is robbed and murdered before he can turn over the piece. Lucifer gets Chloe assigned to the case, who discovers that the killer is Chet Ruiz, one of Charlotte's clients and a powerful crime lord. Amenadiel and Dan bond over feeling unable to compete with Lucifer. Linda is stripped of her medical license for ethics violations and Lucifer unintentionally botches her appeal by revealing his sexual arrangement with her. Maze attacks Lucifer for manipulating her during their time on Earth. Charlotte is coerced into stealing Chet's phone from the police, but Chloe finds out. She also learns that Charlotte is the "ex-wife of Lucifer's dad" and gets her to take part in a sting operation. The piece turns out to be a rare tome that only Amenadiel can read. Maze forces the chairman of the ethics board to restore Linda's license and Charlotte accidentally kills Chet by exposing him to divine light after he stabs her. Lucifer and Amenadiel discover that the latter's necklace contains the third piece of the Blade and that Amenadiel is their Father's favorite son.
3118"The Good, the Bad, and the Crispy"Karen GaviolaIldy ModrovichMay 29, 2017 (2017-05-29)T13.200683.31[38]
Linda attempts to conceal Charlotte's wound but Lucifer recognizes that her body will soon burst. He sends Maze to find Amenadiel while he covers up Chet's murder. Ella finds the cleaners Charlotte hired and Chloe confronts Lucifer about letting his personal problems interfere with work. Amenadiel refuses to reassemble the Blade, citing renewed loyalty to his Father. Charlotte escapes, apparently kills one of the cleaners, and forces Linda to reveal Lucifer's plan. She then threatens to kill Chloe unless the last piece of the Blade, which is in Dan's possession, is delivered to her. While Amenadiel stops time for Maze to help Linda, Chet's brother, the cleaner's real killer, attempts to shoot Lucifer and Charlotte. Lucifer ignites the Blade and opens a rift leading outside the universe, where his mother can create her own world free from God's influence, and throws the Blade through with her. Later, the real Charlotte is revived, having no memory of the time her body was inhabited. At the hospital, Linda encourages Lucifer to reveal his true nature to Chloe. Before he can, however, he is knocked out cold and wakes up to find himself in the desert with his wings restored.

text: Season 3 (2017–18)[edit]

text:
No.overallNo. inseasonTitleDirected byWritten byOriginal air date [c]Prod.codeUS viewers(millions)321"They're Back, Aren't They?"Karen GaviolaIldy ModrovichOctober 2, 2017 (2017-10-02)T13.207513.92[48]
Lucifer encounters a fleeing criminal and steals his clothes before getting the police to return him to Los Angeles. He asks Linda to remove his wings, but she refuses. Chloe brings him onto a new case, a dehydrated corpse found in the desert where Lucifer woke up, while overseen by her new lieutenant, Marcus Pierce. The body turns out to be that of a wealthy man and his close friend reveals that he paid "kidnappers" to prank the victim. While attempting to restore his wings, Amenadiel discovers a severed pair from Lucifer. Lucifer tries to show Chloe his true "devilface," but cannot. To lure out the "kidnappers," Pierce instructs Dan to get himself kidnapped, which Lucifer arranges. However, he makes himself the target at the last moment because he suspects the kidnappers to be behind his own abduction. He interrogates them and learns that the dead man was turned over to another kidnapper. The man reveals that he was hired by the Sinnerman, a mysterious crime boss, to abduct Lucifer. Lucifer, whose wings grew back after he cut them off again, initially suspects that God restored his wings as punishment for sending Charlotte to a void, but eventually comes to believe that it is "something darker" connected to Sinnerman.
332"The One with the Baby Carrot"Louis MilitoJoe HendersonOctober 9, 2017 (2017-10-09)T13.207523.33[49]
After failing to connect a recent murder to the Sinnerman, Lucifer is told by Chloe that he has to either bring her evidence that he exists or allow the case to die. Pierce assigns them a new case: a murdered comedian who accused his rival, Bobby Lowe, of stealing his jokes. Amenadiel asks Linda to help him destroy Lucifer's severed wings. While attending one of Bobby's shows, Lucifer storms the stage and accidentally shoots him with a gun hidden in a hand puppet. It turns out that Bobby did steal the jokes and wanted to be fired from the show. Pierce warns Lucifer that the Sinnerman is real and killed someone close to him during his previous posting in Chicago. Lucifer and Dan run a sting operation, netting an old friend of Bobby's who reveals that the dead man was working on a new set with Sheila, Bobby's warm-up act. They find and arrest her and Pierce makes an agreement with Lucifer to help find the Sinnerman so long as he keeps Chloe out of it. Inspired by something Sheila said, Lucifer decides to focus not on his regrowing wings or the loss of his "devilface," but on his skill as a granter of favors.
343"Mr. & Mrs. Mazikeen Smith"Tara Nicole WeyrJoe Henderson & Alex KatsnelsonOctober 16, 2017 (2017-10-16)T13.200693.19[50]
Bored with her life, Maze decides to hunt a more challenging target: a serial killer named Ben Rivers, who has evaded every attempt at capture. Tracking him to Canada, she eventually finds a witness and blackmails him into revealing the location of Rivers' girlfriend. Lucifer and Chloe question Rivers' former attorney and learn that he is a master manipulator. Against Chloe's concerns that Maze might be in trouble, Lucifer sends her the bounty's address. Rivers then reveals that he used to work as a bounty hunter for Lt. Herrera, the cop who sent Maze to catch him, and the two form an unlikely bond. Dan arrives at Chloe's request, but Rivers escapes to avoid being returned to police custody. With Lucifer's help, Chloe proves Rivers to be innocent, allowing them to bring Herrera, the real murderer, to justice. Despite her feelings for him, Maze decides to leave Rivers behind and return home. Rivers warns her that Herrera was working for someone very powerful and that she is likely now in danger. A shadowy figure is then shown placing a file on Maze into a drawer filled with files on all the protagonists.
354"What Would Lucifer Do?"Eagle EgilssonJason NingOctober 23, 2017 (2017-10-23)T13.207533.26[51]
When Amenadiel shares his insights with Lucifer, the latter suggests that Amenadiel needs to "walk in his shoes" in order to understand him. Marcus assigns Chloe a new case. The victim, a counselor who worked with troubled kids, is shown to have been murdered with a tool belonging to a missing resident. Lucifer calls in a favor, finds the resident, and brings him back to the station. He turns out to be innocent, despite Lucifer's insistence that juveniles are incapable of reform. To prove his point, he sets up a marijuana distribution ring with the other kids, inadvertently providing Chloe with a lead that uncovers the murder weapon. Amenadiel gets arrested after assaulting a pimp, but Dan bails him out. The two talk and Amenadiel realizes that Lucifer's excessive lifestyle just covers up how lonely he is. As Pierce and Chloe track the new murder suspect, Pierce is shot by the man while protecting Chloe. Lucifer, angered, tracks down the shooter and nearly kills him, but Amenadiel intervenes. Based on his experiences, Amenadiel concludes that his "test" is to have Lucifer's back. Lucifer rebukes him, enraged by the thought that his feelings for Chloe are responsible for what he has become.
365"Welcome Back, Charlotte Richards"Nathan HopeChris RaffertyOctober 30, 2017 (2017-10-30)T13.207543.37[52]
Simon Fisher, a chemist at a pudding company, is found dead in one of his vats and the company's owner turns out to be represented by Charlotte Richards, for whom Lucifer still has conflicting feelings. He and Chloe learn that the dead man wanted to sell his secret formula to a rival company and identify a fixer who had been spying on him. An encounter with Dan inspires Charlotte to visit Lucifer for help filling in her missing memories; however, she mistakenly believes that they were romantically involved. After Lucifer clears things up, he discovers that she was trapped in Hell while his mother inhabited her body. He encourages her to confess her sins, which include withholding crucial evidence from Chloe. Using it, Ella determines that the pudding's ingredients can cause renal failure and that Simon committed suicide to expose the company's wrongdoing. Overwhelmed with guilt, Charlotte has a breakdown and holds the owner, fixer, and rival owner hostage to force them to reveal who killed Simon. Lucifer talks her down and Chloe uses a recording he made to charge them with endangering public health. Lucifer meets Charlotte and admits that she is not to blame for his mother's actions; the two agree to start a professional relationship.
376"Vegas with Some Radish"Karen GaviolaIldy Modrovich & Sheri ElwoodNovember 6, 2017 (2017-11-06)T13.200723.48[53]
At Chloe's birthday celebration, Lucifer receives word that Candy, his fake wife, has disappeared. Without telling Chloe, he and Ella travel to Las Vegas, where they find a woman dressed as Candy murdered in her apartment. Lucifer suspects that a loan shark who once tried to seize Candy's father's club was responsible, but he turns up dead as well. While investigating the loan shark's wife, a pit boss at a nearby casino, Ella is caught counting cards at blackjack and she and Lucifer are thrown out. Candy, who had been posing as a waitress while following the same lead, admits that the dead woman was a friend of hers. Lucifer and Ella set a trap at the club and discover that Jedd, the bartender, was the killer; Ella subdues him and they return home. Entering his apartment, Lucifer discovers that Chloe, Dan, and Linda threw a party and attempted unsuccessfully to break into his safe. After admitting to Chloe that he was wrong not to tell her why he was leaving, he opens the safe and presents her with a gift: a necklace made from the bullet she shot him with when they first started working together.
387"Off the Record"Eduardo SánchezStory by : Jen Graham Imada Teleplay by : Chris Rafferty & Mike CostaNovember 13, 2017 (2017-11-13)T13.200713.58[54]
After waking up from a coma, Linda's estranged husband Reese Getty, an investigative reporter, discovers her affair with Lucifer. Enraged, he decides to write an exposé to ruin his reputation. Lucifer and Chloe investigate a serial killer and Linda serves Reese with divorce papers. Lucifer confronts Reese and persuades him to drop his investigation; just as Reese accepts that Lucifer is right, he witnesses him use his Devil face to obtain a confession. A year later, a nearly deranged Reese is asked by Chloe to assist in the still-ongoing investigation and decides to kill Lucifer, shooting him in the middle of a therapy session. Linda explains that she knows Lucifer's true nature and considers him her friend, but Reese storms out. He then tracks down the killer and gets him to target Lucifer, but an innocent woman is killed instead. Reese blames Lucifer for his actions. Lucifer counters that humans like Reese are responsible for damning themselves. After attacking Linda in a rage, Reese uses himself as bait to lure the killer out, accepting his fate. It is then revealed that the whole episode was Reese's damned soul seeking redemption, trapped in a time loop in Hell.
398"Chloe Does Lucifer"Louis MilitoJulia FontanaNovember 20, 2017 (2017-11-20)T13.207553.26[55]
Lucifer grows concerned when Amenadiel calls him "boring" sets out to prove him wrong. A woman named Kim Jones is murdered and Chloe traces the last call she made to Top Meet, a popular dating app. Chloe attends the company's mixer and adopts Lucifer's mannerisms to blend in. She and Dan locate a man who reveals that Kim was about to receive a large sum of money. It turns out that Kim founded Top Meet and wanted to make it more accessible, and that Mac, whom she chose as CEO, killed her to preserve the app's exclusivity. While planning her ex-husband's funeral, Linda has an existential crisis, and reveals that Reese's passing has made her fear death. Amenadiel manages to calm her by explaining that he once had a similar crisis, and they manage to fix their friendship. Wanting to avoid damnation, Charlotte lies to Ella about wanting to study forensics, giving her an excuse to follow the latter around. When Ella points out that being "good" means not just words, but actions, Charlotte decides to leave her practice and join the district attorney's office. Lucifer briefly contemplates whether being boring is for him, before deciding it is not.
409"The Sinnerman"Marisol AdlerJenn KaoDecember 4, 2017 (2017-12-04)T13.207563.39[56]
Pierce rejects Chloe's request for a personal day. Joey Pileggi, who asked Lucifer for a favor months before, winds up murdered. Lucifer reveals the favor was getting him work as a mob courier. Maze becomes uneasy about Linda and Amenadiel growning closer. Charlotte, as a prosecutor, joins Chloe and Lucifer as they question Frankie Ferrante, the mobster who mentored Joey, and learn that his death was not mob-related. Another body turns up, which Lucifer recognizes as another client. Ella identifies the killer as the Sinnerman, who lures Lucifer into an abandoned building and traps him inside. With Charlotte's help, Chloe manipulates Frankie into going after the Sinnerman, but Charlotte feels hurt that Chloe didn’t tell her the plan. Maze finds Lucifer and forces him to acknowledge her feelings before freeing him. Pierce tells Chloe that he plans to get revenge against the Sinnerman for murdering his brother. The Sinnerman ambushes Frankie, but Chloe and Pierce manage to capture him. Maze asks Linda to stop seeing Amenadiel. Dan comforts Charlotte and tells her being "good" takes time and commitment. Lucifer tries using his powers on the Sinnerman, but the latter gouges his own eyes out before he can do so.
4110"The Sin Bin"Greg BeemanSheri ElwoodDecember 11, 2017 (2017-12-11)T13.207573.36[57]
The Sinnerman claims that a woman will soon be drowned in a spot only he knows. Chloe tracks a possible lead, which takes them to the woman's car and a planted bomb. Realizing the only option, Chloe has Ella help her smuggle the Sinnerman out. Trixie encourages Charlotte to be a better mother. Pierce and Chloe manage to save the woman, but Lucifer and the Sinnerman vanish. The woman apparently owed the Sinnerman a debt, and set up her own kidnapping. The Sinnerman wakes up in Lucifer's private estate, where Maze proceeds to torture him close to death. Despite a celestial rule dictating that angels may not take human lives, Lucifer concludes that killing him is the only solution. Maze abandons him in disgust. Lucifer realizes that the Sinnerman's true desire is to die by his hand. Pierce arrives with Chloe and shoots the Sinnerman dead. Trixie gets Charlotte to go on a date with Dan. After deducing that the Sinnerman was working for someone more powerful, Lucifer calls Pierce to Lux. It is revealed that Pierce is in fact the immortal Cain, the world's first murderer who is destined to wander the earth forever.
4211"City of Angels?"Mark TonderaiJason Ning & Jenn KaoJanuary 1, 2018 (2018-01-01)T13.200703.11[58]
In 2011, Lucifer leaves Hell for Los Angeles. His brother Amenadiel demands that he return to Hell, but Lucifer talks him into delaying their departure. Amenadiel is shot and his necklace is stolen. Knowing the danger of exposing humans to divinity, he persuades Lucifer to help him find it in return for a favor. Meanwhile, beat cop Chloe Decker and her husband, Det. Dan Espinoza, investigate the murder of MMA fighter Aiden Scott. Lucifer abducts the promoter who tried to fix Aiden's last fight, summoning his demon torturer Mazikeen to interrogate him. Chloe visits the promoter's lawyer, Charlotte Richards, and pressures her into setting up a sting operation with her client. Lucifer sets up a fight with Amenadiel to show that they are the same. Amenadiel dominates the fight, but allows Lucifer to win by submission to prove that, unlike Lucifer, he can control his pride. The sting nets Aiden's mentor Gil, but Lucifer and Amenadiel snatch him up and force him to confess to murder and theft before leaving him to be arrested. Lucifer uses his favor to get Amenadiel to leave him on Earth. He takes over the promoter's club and has Maze cut off his wings.
4312"All About Her"Tara Nicole WeyrAlex KatsnelsonJanuary 22, 2018 (2018-01-22)T13.207583.77[59]
Lucifer accuses Pierce of working for God, but he denies it. A surfer's body is found on a private beach. Chloe, furious with Lucifer for going behind her back, blocks him from the investigation. Charlotte chastises Pierce for yelling at Ella, and Amenadiel learns, falsely, that he has contracted chlamydia. Linda advises Lucifer to pay more attention to Chloe's needs and Dan tells him to be helpful without getting in her way. Chloe suspects that a surfer gang may have been involved in the murder, sending Dan to go undercover and work their leader, Wild Child. After learning that Pierce intends to skip town, Lucifer discovers that he wishes to die, and had previously put himself and Chloe in danger hoping to be killed after learning that Lucifer is vulnerable around Chloe. Wild Child tells Dan that the gang had nothing to do with the murder, and Chloe deduces that the "owners" of the beach were framing them to cover up their illegal acquisition of the land. Linda tells Amenadiel that she is not comfortable dating him due to Maze's objections, but they kiss, and Maze sees them. Lucifer makes a deal with Pierce to end his life.
4413"Til Death Do Us Part"Sherwin ShilatiMike CostaJanuary 29, 2018 (2018-01-29)T13.207593.67[60]
Pierce loses faith in Lucifer's lack of progress. Maze theorizes that he must have an exploitable weakness. Murdered woman, June Lee, turns out to be a criminal named Sandra Jiang, whose death is found to be connected to her role cooking ecstasy. Lucifer collects the mobster who once employed Sandra. He agrees to cooperate with the investigation in return for one of Sandra's recipes. To prove that Sandra was selling her product independently, Chloe decides to have Lucifer and Pierce pose as a married couple in order to infiltrate her neighborhood. Dan and Charlotte go on their first date, but Maze crashes it due to her attraction to Charlotte's pain. The cops learn that a "watchdog" who has been terrorizing the neighborhood is connected Sandra's death. Lucifer lures him out, but he turns out be innocent. His wife turns out to be the killer, having mistakingly believed Sandra to be having an affair with her husband. Charlotte decides that she needs some time away from relationships in order to refocus. Pierce notes that as much as Lucifer wants to help him, he is more interested in using him to get revenge on his father.
4514"My Brother's Keeper"Claudia YarmyJoe Henderson & Jason NingFebruary 5, 2018 (2018-02-05)T13.207603.71[61]
Lucifer, realizing that he understands nothing about Cain's Mark, decides to ask Amenadiel for help, but he refuses. Ella's older brother, Jay Lopez, disappears after a man he was meeting with is murdered. Chloe asks Ella to recuse herself from the investigation, but she and Maze go off to find him anyway. Charlotte is turned down by Linda when she asks for a consultation, as she still fears her. The victim is tied to a jewelry store heist, and Lucifer and Chloe check with the owner, who reveals that the "robbery" was actually insurance fraud. Pierce tracks down Amenadiel, who he knows gave him the mark, and assaults him in anger. Chloe and Dan confirm that Jay was, in fact, hired to "clean" the stolen diamonds. Jay flees, and goes after the real killer, the store's investigator, but gets captured. Pierce points out that he and Amenadiel both tried to kill their brothers, but that Amenadiel's failure makes him worse. Maze eliminates the killer and saves Jay. Linda decides to treat Charlotte. Lucifer catches Jay stealing the diamonds, and vows to punish him if he ever commits a crime again. Amenadiel decides that he will do whatever it takes to protect his brother from Pierce.
4615"High School Poppycock"Louis MilitoChris Rafferty & Jen Graham ImadaFebruary 26, 2018 (2018-02-26)T13.207613.18[62]
Lucifer has a nightmare about Chloe dying. On his quest to help Pierce, Lucifer uses murdered author Kathleen Pike's latest work to overcome his lack of ideas. Linda and Amenadiel continue their romance in secret, unaware that Maze already knows. Chloe learns that the characters in Kathleen's books are based on people from her high school days. Lucifer agrees to go undercover with her at an upcoming reunion to find the killer. Maze intentionally sets up Linda and Amenadiel on blind dates with herself and Todd, the man Lucifer impersonates at the reunion, as revenge for their deception. Maze angrily storms out after Linda defends her actions. Chloe and Lucifer discover that all of the party attendees have an alibi except for Todd, who explains that Kathleen had a different ending for her book from what her editor wanted. Chloe uses that information to set a trap for him. Lucifer has a breakdown when he realizes that Kathleen's work was destroyed, and leaves. Linda breaks up with Amenadiel for Maze's sake. Lucifer throws Chloe the prom she never had and also has an epiphany: to break Pierce's curse, he has to prevent the circumstances that caused it.
4716"Infernal Guinea Pig"Eagle EgilssonJenn Kao & Julia FontanaMarch 5, 2018 (2018-03-05)T13.207623.13[63]
To break Pierce's curse, Lucifer proposes resurrecting Abel from Hell. However, the plan goes awry when Abel is revived in the body of Bree Garland, the assistant to B movie producer Alexa Lee, whose office was recently blown up by a bomb. Based on information provided by Maze, Lucifer and Pierce track Abel to a pool party. Amenadiel arrives and tries to persuade Abel to commit suicide by claiming he is still in Hell. Chloe's investigation uncovers links between Alexa's film studio and a Bolivian drug cartel, and she realizes that Bree, who had been aware of her employer's crimes, was trying to expose her. Abel encounters Pierce and shoots him, but he is unharmed. Chloe takes Bree and Lucifer to Alexa's office for evidence, where they narrowly manage to defuse another bomb. Using a recovered fingerprint, Chloe has Alexa arrested for money laundering. Charlotte makes progress in therapy with Linda, while Amenadiel, after fighting with Maze, calls her childish for ruining his chance at romance. Abel, having somewhat reconciled with his brother, asks for some space to figure himself out. Lucifer, concerned about Chloe's safety, informs Pierce that he is ending their partnership and Abel is killed by an ambulance.
4817"Let Pinhead Sing!"Alrick RileyIldy Modrovich & Sheri ElwoodMarch 12, 2018 (2018-03-12)T13.207632.97[64]
Pop singer Axara sees her life threatened when one of her backup dancers (wearing a mask and the same outfit as Axara) gets killed by a high-powered firework. Chloe investigates without much help from Lucifer, who is still worried about putting Chloe in danger and tries to avoid her. He does offer to quarantine Axara at Lux until the killer is found, though. Suspicion falls on a crazed fan, who is soon found dead himself, then to Axara's manager, before evidence ultimately leads Chloe to Axara's former high school friend and current tour manager, Cece. Elsewhere, Pierce is dejected over Lucifer backing off on helping him die and the fact that Abel could not kill him either. Ella convinces him to talk to Dan, which does no good, and Pierce also has a conversation with Amenadiel that seems to help. Pierce starts to believe again that Chloe is the key, and he asks her out on a date in full view of Lucifer. Meanwhile, Linda tries to reconcile her friendship with Maze, even getting Charlotte to mediate their dispute, but Maze will not budge off her high horse.
4918"The Last Heartbreak"Hanelle CulpepperAlex Katsnelson & Mike CostaMarch 19, 2018 (2018-03-19)T13.207643.23[65]
In 1958, Pierce, an LAPD detective, is assigned to investigate a serial murderer known as the "Broken Hearts Killer". In the present, two new victims are found that match the killer's MO. Lucifer tries to get between what he suspects is a growing romance between Chloe and Pierce. Dan tells a drunken Maze to pull herself together for Chloe's sake. More victims turn up, validating Pierce's belief that a copycat is responsible. Amenadiel runs into Charlotte, and Linda advises him to keep his distance. Pierce visits the granddaughter of his partner in 1958, getting back his files on the case. Maze and Dan argue, and Maze ends up insulting Trixie unaware that she is behind her. Using a radio call-in show to set up a sting, Chloe and Pierce pose as a cheating couple and lure out the killer, who turns out to be a man who found the original killer's journals and became obsessed with them. Charlotte persuades Amenadiel to reveal the truth to her. Pierce decides to pursue a relationship with Chloe, with Lucifer's blessing.
5019"Orange Is the New Maze"Nathan HopeJenn KaoMarch 26, 2018 (2018-03-26)T13.207653.19[66]
Maze asks Lucifer to send her back to Hell; Lucifer refuses and suggests that she needs to blow off some steam. Linda warns Charlotte not to see Amenadiel again. Security footage of a new murder seems to implicate Maze as the killer, and Chloe learns that the victim was one of her bounties. Maze subsequently turns herself in, claiming guilt, and even hands over the murder weapon. However, when Chloe presses her, it becomes clear that Maze only wants to take the fall. Charlotte forces Lucifer to tell her about his mother. Maze escapes custody, and Chloe determines that someone is framing her. Pierce becomes increasingly jealous of the "special relationship" between Lucifer and Chloe. A conversation with a former bounty leads them to a wealthy winery owner, who blames Maze for getting her son killed. Chloe persuades Maze to spare the owner's life; instead, she stabs her in the foot. Lucifer, prompted by Amenadiel, reveals his true self to Charlotte. When Lucifer tries to persuade her to stay, Maze, angry that he refuses to consider her feelings, prepares to leave town. However, Pierce stops her, and promises to help her if she helps him.
5120"The Angel of San Bernardino"Tara Nicole WeyrJason NingApril 16, 2018 (2018-04-16)T13.207663.18[67]
A man is killed during a home invasion, but the homeowner survives due to the intervention of a "guardian angel". A news story then surfaces of a guardian angel rescuing a victim in San Bernardino, leading Lucifer to wonder whether he could be responsible, even though he has no memory of the deeds. Pierce's relationship with Chloe is strained by her refusal to let him meet Trixie. Linda suggests that Lucifer may not be aware of his actions because he is unconsciously trying to distract himself; both he and Amenadiel suspect that God is responsible. Charlotte starts behaving outlandishly, as she believes that she will end up in Heaven no matter what she does. Chloe finds a video of a fight involving the victim, which leads them to an actor who was hired to keep him from breaking his addiction to heroin. Lucifer's refusal to sleep interferes with his work, and Chloe accuses him of being jealous. Lucifer forces the murderer to confess, after which Maze visits him and reveals that she is the "angel", having done so to keep Lucifer from figuring out Pierce's plan to use Chloe. However, Pierce changes his mind and dumps Chloe, breaking her heart in the process. Furious, Lucifer attacks Pierce, whose mark has vanished, rendering him mortal.
5221"Anything Pierce Can Do I Can Do Better"Jim VickersAlex KatsnelsonApril 23, 2018 (2018-04-23)T13.207672.82[68]
Pierce contemplates suicide, but realizes he truly loves Chloe. Seeing a chance for a normal life where he can grow old with her and die, he tries to win her back. A new murder case comes in: Reina Markova, a prima ballerina who was strangled while practicing. Lucifer decides that the only way to get Chloe back is to outshine Pierce in every way. Pierce reneges on his plan to frame Lucifer for his murder, which angers Maze. Reina's former understudy reveals that she was set to host a reality competition show, but ultimately backed out; it then turns out that the show's creator was blackmailed into offering her the job. Amenadiel recruits Charlotte to help him expose Pierce as the Sinnerman. Lucifer and Chloe uncover an affair between Reina and the ballet company chairman, while Charlotte is caught trying to follow Pierce and attempts to seduce him, but fails. Ella and Dan deduce that Reina's partner Miguel was behind the blackmail and killed her to protect himself. Pierce and Lucifer both invite Chloe to have dinner with them, but Pierce makes the decision to tell Chloe how he feels and proposes to her, just as Lucifer arrives to do the same thing.
5322"All Hands on Decker"Eduardo SánchezSheri ElwoodApril 30, 2018 (2018-04-30)T13.207682.84[69]
Ella plans Chloe's bachelorette party. Lucifer and Dan investigate the murder of a dog trainer, with Lucifer taking the lead to "understand" Chloe better. Pierce's Mark reappears, which Maze interprets as a sign that Chloe is unsure of her love. Amenadiel recruits Charlotte to break off the engagement. Dan enters a gambling den in search of a suspect, before Lucifer stages a surprise police raid. Maze intentionally throws a boring party, and Linda, Ella, and Charlotte hire a party bus instead. Amenadiel tries to persuade Pierce against losing his immortality. The murder suspect reveals that he is an amateur trainer, and that his purebred mastiff is expecting puppies which could fetch high prices. Ella figures out that Maze and Charlotte are both trying to manipulate Chloe, and stops the party. A drunken Chloe rides off in the bus, while Dan and Lucifer deduce that the victim's partner is the killer and arrest him. Maze learns that Pierce's Mark is fake and tries to kill him, but he uses Trixie to force her to leave. Dan expresses his feelings for Charlotte, and they begin a real relationship. Chloe ends her engagement and resumes working with Lucifer, to Pierce's anger.
5423"Quintessential Deckerstar"Claudia YarmyIldy ModrovichMay 7, 2018 (2018-05-07)T13.207692.90[70]
Charlotte continues to have nightmares of Hell. Lucifer struggles to tell Chloe how he feels. Retired baseball player Forest Clay's wife is murdered. Charlotte identifies him as the killer, revealing that she destroyed evidence of another murder for him years before. Amenadiel tries to restore his wings. Ella discredits Clay's alibi, and Chloe discovers that both he and his wife were cheating on each other. Pierce and Maze plan to kill Amenadiel so Pierce can get his Mark back. Charlotte stages a distraction while Amenadiel steals information from her former law firm, which leads them to a murder matching Charlotte's version of events. Chloe contemplates her feelings for Lucifer. Charlotte assists Chloe in apprehending Clay. When Maze turns on Pierce, he sedates her and shoots at Amenadiel, only to kill Charlotte when she shields him. Lucifer confesses his feelings and that he is the Devil to Chloe, who says he is not, at least not to her, and they kiss. A grieving Amenadiel regains his wings, using them to bring Charlotte's soul to Heaven as Lucifer and Chloe receive a phone call, leading to Chloe, Lucifer, and Dan arriving at the crime scene where they find Charlotte's body.
5524"A Devil of My Word"Eagle EgilssonJoe HendersonMay 14, 2018 (2018-05-14)T13.207703.20[71]
Pierce takes control of the investigation into Charlotte's death. Dan finds Charlotte's notes on Pierce, and informs Chloe and Lucifer that Pierce is the killer. Pierce arranges for one of the criminals Charlotte was prosecuting to be framed for her murder. Dan has Ella tip off Pierce on their progress, prompting him to send a hitman for Dan, but the hitman is captured. Believing that Linda is in danger, Maze escapes Pierce's men to find her. Maze and Linda reconcile. Lucifer tells Ella that he suspects Amenadiel is right; God is not responsible for changing him, he is. The captured hitman gives Chloe information that leads her and Lucifer into an ambush. Chloe is shot and Lucifer uses his wings to shield her. He carries her to safety before using his wings to subdue Pierce's henchmen. Pierce confronts Lucifer with one of Maze's daggers, but Lucifer kills Pierce with it instead. Pierce believes that he will be going to Heaven as he feels no regrets, but Lucifer reveals that Pierce will be haunted by the murder of Charlotte for eternity in Hell. The anger Lucifer feels causes his devil face to return, allowing Chloe to see his true nature.
Bonus episodes [a]
5625"Boo Normal"Lisa DemaineJen Graham ImadaMay 28, 2018 (2018-05-28)T13.207712.42[72]
As Ella contemplates moving back to Detroit, she assists on the case of a murdered psychologist. While doing so, she is visited by Rae-Rae, a "ghost" who first appeared to Ella when she survived a car crash at the age of 8. However, Ella had not seen or heard from Rae-Rae since leaving Detroit five years ago, and she tries to figure out why she has reappeared. After hearing the story, Lucifer realizes that Rae-Rae is Azrael, the Angel of Death. In a conversation between the two, Azrael tells Lucifer that she was behind Ella moving to California and working for the LAPD. She explains that because she could not be in either one's lives, she wanted to ensure her "favorite brother and favorite human" would be together in the same place.
5726"Once Upon a Time"Kevin AlejandroStory by : Ricardo Lopez Jr. Teleplay by : Ildy Modrovich & Joe HendersonMay 28, 2018 (2018-05-28)T13.207722.42[72]
God narrates events in an alternate timeline, where Chloe's father, John Decker, survived the shooting that was supposed to take his life. Thus, Chloe is not inspired to become a cop and has instead remained an actress. The story ponders if Chloe and Lucifer would have still found each other. They do when Chloe's friend, a stunt man in her current film, is murdered at Lux, and both Chloe and Lucifer become interested in finding the killer. They manage to solve the case with the help of Ella (who in this reality is a professional carjacker and mechanic), and John confesses that while he is proud of his daughter, he does not want her to follow her dream of joining the police because of his fear that she would be in harm's way. Nevertheless, Chloe decides that she wants to consider the possibility, and Lucifer jokes that perhaps they will get to work together again. The episode ends with God reflecting on the fact that, despite being in completely different circumstances, Chloe and Lucifer are destined to be together as in the original timeline.

text: Season 4[edit]

text:
No.overallNo. inseasonTitleDirected byWritten byOriginal release date [5]Prod.code581"Everything's Okay"[73]Sherwin ShilatiJoe Henderson2019 (2019)TBA
592"Somebody's Been Reading Dante's Inferno"[74]Sam HillIldy Modrovich2019 (2019)TBA
603"O, Ye Of Little Faith, Father"[75]Jessika BorsiczkyJason Ning2019 (2019)TBA

text: Ratings[edit]

text: Season 1 (2016)[edit]

text:
No.

Title

Air date
Rating/share(18–49)
Viewers(millions)
DVR(18–49)
DVR viewers(millions)
Total(18–49)
Total viewers(millions)

1

"Pilot"

January 25, 2016
2.4/7
7.16[8]
1.4
3.63
3.8
10.78[76]

2

"Lucifer, Stay. Good Devil."

February 1, 2016
2.0/6
6.00[9]
1.1
3.30
3.1
9.30[77]

3

"The Would-Be Prince of Darkness"

February 8, 2016
1.7/5
5.47[10]
1.1
3.00
2.8
8.46[78]

4

"Manly Whatnots"

February 15, 2016
1.6/4
5.13[11]
1.1
2.97
2.7
8.10[79]

5

"Sweet Kicks"

February 22, 2016
1.5/4
4.86[12]
1.1
2.97
2.6
7.83[80]

6

"Favorite Son"

February 29, 2016
1.3/4
3.91[13]
1.1
3.00
2.4
6.91[81]

7

"Wingman"

March 7, 2016
1.3/4
4.24[14]
1.0
2.80
2.3
7.04[82]

8

"Et Tu, Doctor?"

March 14, 2016
1.2/4
3.86[15]
1.1
3.05
2.3
6.91[83]

9

"A Priest Walks into a Bar"

March 21, 2016
1.2/4
3.82[16]
1.1
3.04
2.3
6.86[84]

10

"Pops"

March 28, 2016
1.2/4
3.76[17]
1.1
2.94
2.3
6.68[85]

11

"St. Lucifer"

April 11, 2016
1.1/4
3.44[18]
1.0
2.86
2.1
6.28[86]

12

"#TeamLucifer"

April 18, 2016
1.3/4
3.81[19]
0.9
2.68
2.2
6.49[87]

13

"Take Me Back to Hell"

April 25, 2016
1.3/4
3.89[20]
0.9
2.68
2.2
6.57[88]

text: Season 2 (2016–17)[edit]

text:
No.

Title

Air date
Rating/share(18–49)
Viewers(millions)
DVR(18–49)
DVR viewers(millions)
Total(18–49)
Total viewers(millions)

1

"Everything's Coming Up Lucifer"

September 19, 2016
1.3/4
4.36[21]
0.9
2.75
2.2
7.11[89]

2

"Liar, Liar, Slutty Dress on Fire"

October 3, 2016
1.1/4
3.67[22]
0.9
2.69
2.0
6.37[90]

3

"Sin-Eater"

October 10, 2016
1.0/3
3.67[23]
0.9
2.63
1.9
6.30[91]

4

"Lady Parts"

October 17, 2016
1.1/4
3.63[24]
0.7
2.30
1.8
5.92[92]

5

"Weaponizer"

October 24, 2016
1.0/4
3.55[25]
0.8
2.26
1.8
5.81[93]

6

"Monster"

October 31, 2016
0.9/3
3.42[26]
0.9
2.40
1.8
5.82[94]

7

"My Little Monkey"

November 7, 2016
1.0/3
3.52[27]
0.8
2.51
1.8
6.03[95]

8

"Trip to Stabby Town"

November 14, 2016
1.1/4
3.87[28]
0.7
2.26
1.8
6.13[96]

9

"Homewrecker"

November 21, 2016
1.0/3
3.63[29]
0.8
2.24
1.8
5.87[97]

10

"Quid Pro Ho"

November 28, 2016
1.1/4
4.09[30]
0.7
2.13
1.8
6.22[98]

11

"Stewardess Interruptus"

January 16, 2017
1.1/4
3.97[31]
0.8
2.28
1.9
6.25[99]

12

"Love Handles"

January 23, 2017
1.2/4
4.17[32]
0.7
2.23
1.9
6.40[100]

13

"A Good Day to Die"

January 30, 2017
1.2/4
4.19[33]
0.7
2.01
1.9
6.20[101]

14

"Candy Morningstar"

May 1, 2017
1.0/4
3.41[34]
0.7
2.09
1.7
5.50[102]

15

"Deceptive Little Parasite"

May 8, 2017
0.9/3
3.25[35]
0.7
1.91
1.6
5.16[103]

16

"God Johnson"

May 15, 2017
0.8/3
3.05[36]
0.7
2.05
1.5
5.10[104]

17

"Sympathy for the Goddess"

May 22, 2017
0.8/3
3.03[37]
0.7
2.07
1.5
5.10[105]

18

"The Good, the Bad, and the Crispy"

May 29, 2017
0.9/3
3.31[38]
0.7
2.00
1.6
5.30[106]

text: Season 3 (2017–18)[edit]

text:
No.

Title

Air date
Rating/share(18–49)
Viewers(millions)
DVR(18–49)
DVR viewers(millions)
Total(18–49)
Total viewers(millions)

1

"They're Back, Aren't They?"

October 2, 2017
1.1/4
3.92[48]
N/A
N/A
N/A
N/A

2

"The One with the Baby Carrot"

October 9, 2017
0.9/3
3.33[49]
0.6
1.82
1.5
5.16[107]

3

"Mr. & Mrs. Mazikeen Smith"

October 16, 2017
0.9/3
3.19[50]
N/A
1.71
N/A
4.90[108]

4

"What Would Lucifer Do?"

October 23, 2017
0.8/3
3.26[51]
N/A
1.87
N/A
5.13[109]

5

"Welcome Back, Charlotte Richards"

October 30, 2017
0.9/3
3.37[52]
N/A
N/A
N/A
N/A

6

"Vegas with Some Radish"

November 6, 2017
1.0/4
3.48[53]
N/A
N/A
N/A
N/A

7

"Off the Record"

November 13, 2017
1.0/4
3.58[54]
N/A
N/A
N/A
N/A

8

"Chloe Does Lucifer"

November 20, 2017
0.9/3
3.26[55]
0.5
1.73
1.4
4.99[110]

9

"The Sinnerman"

December 4, 2017
0.9/4
3.39[56]
N/A
1.87
N/A
5.26[111]

10

"The Sin Bin"

December 11, 2017
0.8/3
3.36[57]
N/A
N/A
N/A
N/A

11

"City of Angels?"

January 1, 2018
0.7/2
3.11[58]
0.7
N/A
1.4[112]
N/A

12

"All About Her"

January 22, 2018
0.9/3
3.77[59]
0.6
1.73
1.5
5.51[113]

13

"Til Death Do Us Part"

January 29, 2018
0.8/3
3.67[60]
N/A
N/A
N/A
N/A

14

"My Brother's Keeper"

February 5, 2018
1.0/4
3.71[61]
N/A
1.73
N/A
5.44[114]

15

"High School Poppycock"

February 26, 2018
0.8/3
3.18[62]
0.5
1.67
1.3
4.85[115]

16

"Infernal Guinea Pig"

March 5, 2018
0.7/3
3.13[63]
0.5
1.65
1.2
4.77[116]

17

"Let Pinhead Sing!"

March 12, 2018
0.7/3
2.97[64]
0.5
1.69
1.2
4.66[117]

18

"The Last Heartbreak"

March 19, 2018
0.8/3
3.23[65]
0.4
1.58
1.2
4.69[118]

19

"Orange Is the New Maze"

March 26, 2018
0.8/3
3.19[66]
N/A
N/A
N/A
N/A

20

"The Angel of San Bernardino"

April 16, 2018
0.7/3
3.18[67]
N/A
1.52
N/A
4.70[119]

21

"Anything Pierce Can Do I Can Do Better"

April 23, 2018
0.7/3
2.82[68]
N/A
1.55
N/A
4.37[120]

22

"All Hands on Decker"

April 30, 2018
0.6/3
2.84[69]
N/A
1.49
N/A
4.33[121]

23

"Quintessential Deckerstar"

May 7, 2018
0.7/3
2.90[70]
N/A
1.49
N/A
4.39[122]

24

"A Devil of My Word"

May 14, 2018
0.8/4
3.20[71]
0.4
1.35
1.2
4.56[123]

25

"Boo Normal"

May 28, 2018
0.5/2
2.42[72]
N/A
N/A
N/A
N/A

26

"Once Upon a Time"

May 28, 2018
0.5/2
2.42[72]
N/A
N/A
N/A
N/A

text: Notes[edit]

text:
^ Jump up to: a b c Before the series was cancelled,[3] co-showrunner Ildy Modrovich stated that two episodes produced for the third season were set to be moved to a potential fourth season.[6] Both episodes were broadcast on Fox on May 28, 2018 as a singular two-hour bonus episode.[7]

Jump up ^ Season 2 episodes 14–17 were broadcast one day earlier in Canada.

Jump up ^ Of the third season, episodes 1-4, 15 and 18-24 were broadcast one day earlier in Canada.[39][40][41][42][43][44][45][46][47]

tag: ol


document_title: Respiratory tract

question_text: where is cilia located in the respiratory tract

root

text: Respiratory tract

text: Structure[edit]

text: The respiratory tract is divided into the upper airways and lower airways. The upper airways or upper respiratory tract includes the nose and nasal passages, paranasal sinuses, the pharynx, and the portion of the larynx above the vocal folds (cords). The lower airways or lower respiratory tract includes the portion of the larynx below the vocal folds, trachea, bronchi and bronchioles. The lungs can be included in the lower respiratory tract or as separate entity and include the respiratory bronchioles, alveolar ducts, alveolar sacs, and alveoli.[citation needed]

tag: p

text: The respiratory tract can also be divided into a conducting zone and a respiratory zone, based on the distinction of transporting gases or exchanging them.

text: The conducting zone includes structures outside of the lungs – the nose, pharynx, larynx, and trachea, and structures inside the lungs – the bronchi, bronchioles, and terminal bronchioles. The conduction zone conducts air breathed in that is filtered, warmed, and moistened, into the lungs. It represents the 1st through the 16th division of the respiratory tract. The conducting zone is most of the respiratory tract that conducts gases into and out of the lungs, but excludes the respiratory zone that exchanges gases. The conducting zone also functions to offer a low resistance pathway for airflow. It provides a major defense role in its filtering abilities.

text: The respiratory zone includes the respiratory bronchioles, alveolar ducts and alveoli, and is the site of oxygen and carbon dioxide exchange with the blood. The respiratory bronchioles and the alveolar ducts are responsible for 10% of the gas exchange. The alveoli are responsible for the other 90%. The respiratory zone represents the 16th through the 23rd division of the respiratory tract.

text: From the bronchi, the dividing tubes become progressively smaller with an estimated 20 to 23 divisions before ending at an alveolus[citation needed].

text: Upper respiratory tract[edit]

text: The upper respiratory tract, can refer to the parts of the respiratory system lying above the sternal angle (outside of the thorax),[1] above the vocal folds, or above the cricoid cartilage.[2][3] The larynx is sometimes included in both the upper and lower airways.[4] The larynx is also called the voice box and has the associated cartilage that produces sound. The tract consists of the nasal cavity and paranasal sinuses, the pharynx (nasopharynx, oropharynx and laryngopharynx) and sometimes includes the larynx.

text: Lower respiratory tract[edit]

text:
Trachea
Mainstem bronchus
Lobar bronchus
Segmental bronchus
Bronchiole
Alveolar duct
Alveolus

text: The lower respiratory tract or lower airway is derived from the developing foregut and consists of the trachea, bronchi (primary, secondary and tertiary), bronchioles (including terminal and respiratory), and lungs (including alveoli).[5] It also sometimes includes the larynx.

text: The lower respiratory tract is also called the respiratory tree or tracheobronchial tree, to describe the branching structure of airways supplying air to the lungs, and includes the trachea, bronchi and bronchioles.[6]

text:
trachea

main bronchus (diameter approximately 1 – 1.4 cm in adults)[7]

lobar bronchus (diameter approximately 1 cm)

segmental bronchus (diameter 4.5 to 13 mm)[7]

subsegmental bronchus (diameter 1 to 6 mm)[7]

conducting bronchiole

terminal bronchiole

respiratory bronchiole

alveolar duct

alveolar sac

alveolus

tag: ul

text: At each division point or generation, one airway branches into two or more smaller airways. The human respiratory tree may consist on average of 23 generations, while the respiratory tree of the mouse has up to 13 generations. Proximal divisions (those closest to the top of the tree, such as the bronchi) mainly function to transmit air to the lower airways. Later divisions including the respiratory bronchiole, alveolar ducts and alveoli, are specialized for gas exchange.

text: The trachea is the largest tube in the respiratory tract and consists of tracheal rings of hyaline cartilage. It branches off into two bronchial tubes, a left and a right main bronchus. The bronchi branch off into smaller sections inside the lungs, called bronchioles. These bronchioles give rise to the air sacs in the lungs called the alveoli.[8]

text: The lungs are the largest organs in the lower respiratory tract. The lungs are suspended within the pleural cavity of the thorax. The pleurae are two thin membranes, one cell layer thick, which surround the lungs. The inner (visceral pleura) covers the lungs and the outer (parietal pleura) lines the inner surface of the chest wall. This membrane secretes a small amount of fluid, allowing the lungs to move freely within the pleural cavity while expanding and contracting during breathing. The lungs are divided into different lobes. The right lung is larger in size than the left, because of the heart's being situated to the left of the midline. The right lung has three lobes – upper, middle, and lower (or superior, middle and inferior), and the left lung has two – upper and lower (or superior and inferior), plus a small tongue-shaped portion of the upper lobe known as the lingula. Each lobe is further divided up into segments called bronchopulmonary segments. Each lung has a costal surface, which is adjacent to the ribcage; a diaphragmatic surface, which faces downward toward the diaphragm; and a mediastinal surface, which faces toward the center of the chest, and lies against the heart, great vessels, and the carina where the two mainstem bronchi branch off from the base of the trachea.

text: The alveoli are tiny air sacs in the lungs where gas exchange takes place. The mean number of alveoli in a human lung is 480 million.[9] When the diaphragm contracts, a negative pressure is generated in the thorax and air rushes in to fill the cavity. When that happens, these sacs fill with air, making the lung expand. The alveoli are rich with capillaries, called alveolor capillaries. Here the red blood cells absorb oxygen from the air and then carry it back in the form of oxyhaemaglobin, to nourish the cells. The red blood cells also carry carbon dioxide (CO2) away from the cells in the form of carboxyhemoglobin and releases it into the alveoli through the alveolor capillaries. When the diaphragm relaxes, a positive pressure is generated in the thorax and air rushes out of the alveoli expelling the carbon dioxide.

text: Microanatomy[edit]

text: The respiratory tract is covered in epithelium, which varies down the tract. There are glands and mucus produced by goblet cells in parts, as well as smooth muscle, elastin or cartilage. Most of the epithelium (from the nose to the bronchi) is covered in ciliated pseudostratified columnar epithelium, commonly called respiratory epithelium.[10] The cilia beat in one direction, moving mucus towards the throat where it is swallowed. Moving down the bronchioles, the cells get more cuboidal in shape but are still ciliated.

text: Glands are abundant in the upper respiratory tract, but there are fewer lower down and they are absent starting at the bronchioles. The same goes for goblet cells, although there are scattered ones in the first bronchioles.

text: Cartilage is present until the small bronchi. In the trachea they are C-shaped rings of hyaline cartilage, whereas in the bronchi the cartilage takes the form of interspersed plates. Smooth muscle starts in the trachea, where it joins the C-shaped rings of cartilage. It continues down the bronchi and bronchioles, which it completely encircles. Instead of hard cartilage, the bronchi and bronchioles are composed of elastic tissue.

text: The lungs are made up of thirteen different kinds of cells, eleven types of epithelial cell and two types of mesenchymal cell.[11] The epithelial cells form the lining of the tracheal, and bronchial tubes, while the mesenchymal cells line the lungs.

text:
Differences in cells along the respiratory tract.

Transverse section of tracheal tissue. Note that image is incorrectly labeled "ciliated stratified epithelium" at upper right.

text: Function[edit]

text: Most of the respiratory tract exists merely as a piping system for air to travel in the lungs, and alveoli are the only part of the lung that exchanges oxygen and carbon dioxide with the blood.

text: Respiration[edit]

text: Respiration is the rhythmical process of breathing, in which air is drawn into the alveoli of the lungs via inhalation and subsequently expelled via exhalation. When a human being inhales, air travels down the trachea, through the bronchial tubes, and into the lungs. The entire tract is protected by the rib cage, spine, and sternum. In the lungs, oxygen from the inhaled air is transferred into the blood and circulated throughout the body. Carbon dioxide (CO2) is transferred from returning blood back into gaseous form in the lungs and exhaled through the lower respiratory tract and then the upper, to complete the process of breathing.

text: Unlike the trachea and bronchi, the upper airway is a collapsible, compliant tube. As such, it has to be able to withstand suction pressures generated by the rhythmic contraction of the diaphragm that sucks air into the lungs. This is accomplished by the rhythmic contraction of upper airway muscles, such as the genioglossus (tongue) and the hyoid muscles. In addition to rhythmic innervation from the respiratory center in the medulla oblongata, the motor neurons controlling the muscles also receive tonic innervation that sets a baseline level of stiffness and size.

text: The diaphragm is the primary muscle that allows for lung expansion and contraction. Smaller muscles between the ribs, the external intercostals, assist with this process.

text: Defences against infection[edit]

text: The epithelial lining of the upper respiratory tract is interspersed with goblet cells that secrete a protective mucus. This helps to filter waste, which is eventually either swallowed into the highly acidic stomach environment or expelled via spitting. The epithelium lining the respiratory tract is covered in small hairs called cilia. These beat rhythmically out from the lungs, moving secreted mucus foreign particles toward the laryngopharynx upwards and outwards, in a process called the mucociliary escalator. In addition to keeping the lower respiratory tract sterile, they prevent mucus accumulation in the lungs. Macrophages in the alveoli are part of the immune system which engulf and digest any inhaled harmful agents.

text: Hair in the nostrils plays a protective role, trapping particulate matter such as dust.[12] The cough reflex expels all irritants within the mucus membrane to the outside. The airways of the lungs contain rings of muscle. When the passageways are irritated by some allergen, these muscles can constrict.

text: Clinical significance[edit]

text: The respiratory tract is a common site for infections.

text: Infection[edit]

text: Upper respiratory tract infections are probably the most common infections in the world.

text: The respiratory system is very prone to developing infections in the lungs. Infants and older adults are more likely to develop infections in their lungs, because their lungs are not as strong in fighting off these infections. Most of these infections used to be fatal, but with new research and medicine, they are now treatable. With bacterial infections, antibiotics are prescribed, while viral infections are harder to treat, but still curable.

text: The common cold/flu is the most common cause for the upper respiratory tract infection, which can cause more serious illness that can develop in the lower respiratory tract. Pneumonia is the most common, and frequent lower respiratory tract infection. This can be either viral, bacterial, or fungal. This infection is very common, because pneumonia can be airborne, and when you inhale this infection in the air, the particles enter the lungs and move into the air sacs. This infection quickly develops in the lower part of the lung, and fills the lung with fluid, and excess mucus. This causes difficulty in breathing, and coughing as the lower respiratory tract tries to get rid of the fluid in the lungs. You can be more prone to developing this infection if you have asthma, flu, heart disease, or cancer[8][dead link]

text: Bronchitis is another common infection that takes place in the lower respiratory tract. It is an inflammation of the bronchial tubes. There are two forms of this infection: acute bronchitis, which is treatable and can go away without treatment, or chronic bronchitis, which comes and goes, but will always affect one's lungs. Bronchitis increases the amount of mucus that is natural in your respiratory tract. Chronic bronchitis is common in smokers, because the tar from smoking accumulates over time, causing the lungs to work harder to repair themselves.[8][dead link]

text: Tuberculosis is one of many other infections that occurs in the lower respiratory tract. You can contract this infection from airborne droplets, and if inhaled you are at risk of this disease. This is a bacterial infection which deteriorates the lung tissue resulting in coughing up blood.[8][dead link] This infection is deadly if not treated.

text: Lung cancer[edit]

text: Some of these cancers have environmental causes such as smoking. When a tobacco product is inhaled, the smoke paralyzes the cilia, causing mucus to enter the lungs. Frequent smoking, over time causes the cilia hairs to die and can no longer filter mucus. Tar from the smoke inhaled enters the lungs, turning the pink-coloured lungs black. The accumulation of this tar could eventually lead to lung cancer, or chronic obstructive pulmonary disease.[5]

text: Chronic obstructive pulmonary disease[edit]

text: Chronic obstructive pulmonary disease (COPD) is a common lower respiratory disease that can be caused by exposure to harmful chemicals, or prolonged use of tobacco. This disease is chronic and progressive, the damage to the lungs is irreversible and eventually fatal. COPD destroys the alveoli, and lung tissue which makes breathing very difficult, causing shortness of breath, hyperventilation, and raised chest. The decreased number of alveoli causes loss of oxygen supply to the lungs, and an increased accumulation of carbon dioxide. There are two types of COPD: primary and secondary. Primary COPD can be found in younger adults. This type of COPD deteriorates the air sacs, and lung mass. Secondary COPD can be found in older adults who smoke or have smoked and have a history of bronchitis. Older terms for COPD are emphysema and chronic bronchitis.[5]

text: Asthma[edit]

text: The bronchi are the main passages to the right and left lungs. These airways carry the oxygen to the bronchioles inside the lungs. Inflammation of the bronchii and bronchioles can cause them to swell up, which could lead to an asthma attack. This results in wheezing, tightness of the chest and severe difficulty in breathing. There are different types of asthma that affect the functions of the bronchial tubes. Allergies can also set off an allergic reaction, causing swelling of the bronchial tubes; as a result, the air passage will swell up, or close up completely.[8][dead link]