Pseudostratified Columnar Epithelium. study Nearly every eukaryotic cell has a single, primary cilium that plays a crucial role in developmental signaling pathways, and is involved in maintaining tissue homeostasis. Fill in the blank: The respiratory epithelia lining the trachea contain ciliated columnar cells and [{Blank}] cells. A. Pseudostrtified columnar epithelium is an epithelium that gives an appearance of being stratified because the cell nuclei are at different levels, but in which all cells reach the basement membrane, hence it is a type of simple epithelium. There are two categories of tissue type: simple and stratified epithelium. Ciliated simple columnar epithelium has ciliated apical border. {{courseNav.course.mDynamicIntFields.lessonCount}} lessons E. Lining Epithelia covers the free surfaces of the body (internal and external) and cavities. Simple columnar epithelia are tissues made of a single layer of long epithelial cells that are often seen in regions where absorption and secretion are important features. Create your account. Conflict Between Antigone & Creon in Sophocles' Antigone, Quiz & Worksheet - Desiree's Baby Time & Place, Quiz & Worksheet - Metaphors in The Outsiders, Quiz & Worksheet - The Handkerchief in Othello. Sensory. flashcard set{{course.flashcardSetCoun > 1 ? Services. Pseudostratified columnar epithelium is a simple epithelium that looks stratified because some of its cells are shorter than others and do not reach the free surface. Log in here for access. imaginable degree, area of Their apical surface is often covered with microvilli to facilitate a strong absorption. This is a single epithelial cell layer on the basement membrane; nuclei occur in different heights. They are used to sweep away debris that could harm the underlying tissues or structures. Stratified Squamous And Pseudostratified Ciliated Columnat, Simple Cuboidal And Columnar. Function and Location. These specialized structures are made of microtubules and can beat in a coordinated manner to move particles in a particular direction. As a member, you'll also get unlimited access to over 83,000 Log in or sign up to add this lesson to a Custom Course. This type of epithelium lines the respiratory tract from the nasopharynx down into the bronchioles of the lung. The ciliated type is also called respiratory epithelium since it is almost exclusively confined to the larger respiratory airways of the nasal cavity, trachea, and bronchi. Q. Goblet cells of the epithelium secrete mucus to trap particles and prevent them from traveling further down respiratory passages. PSEUDOSTRATIFIED COLUMNAR EPITHELIUM WITH STEREOCILIA Epididymal duct. While smaller particles are removed as a part of the normal drainage of the nose, larger or heavier particulate loads are sneezed or coughed out. They are wider than their height and have an oval-shaped nucleus. They serve to replace dead ciliated cells. Pseudostratified columnar epithelium is composed of a single layer of cells, but because the cells are irregular in size and shape, their nuclei are located at various levels. The nuclei of these epithelial cells are at different levels leading to the illusion of being stratified. usually contains lots of goblet cells for mucus secretion. Function and Location Because pseudostratified columnar epithelium are thick cells, they are useful in the process of absorbing and secreting substances as well as in creating a barrier between substances flowing through the cavity space and underlying tissues. Microtubules of the axoneme are at the core of cilia and make them motile. Functions of epithelial cells include secretion, selective absorption, protection, transcellular transport, and sensing. A pseudostratified epithelium is a type of epithelium that, though comprising only a single layer of cells, has its cell nuclei positioned in a manner suggestive of stratified epithelia. Ciliated pseudostratified columnar epithelium has small hair-like projections embedded in the membrane. Squamous cells are flat and scale-like; cuboidal cells are cube-shaped; and columnar cells are tall and rectangular like the columns of a building. Pseudostratified ciliated columnar epithelium containing goblet cells lines most of the major airways. Transitional epithelium: the cells are multilayered. This function is served by cells known as goblet cells, which are named because of their shape. Pseudostratified Columnar Epithelium: The Trachea. just create an account. Non-ciliated pseudostratified columnar epithelia can be found in the membranous part of male vas deferens. This tissue is found in regions where there is a need to secrete mucus to trap foreign bodies and sweep those particles away through the coordinated action of cilia. The presence of pseudostratified columnar epithelium in the upper respiratory tract (composed of the nose, trachea and bronchi) protects the lungs from these irritants. “Pseudostratified Columnar Epithelium.”, Biologydictionary.net Editors. Get access risk-free for 30 days, Pseudostratified ciliated epithelium (40X) Human respiratory tract The bar in this image shows the thickness of the layer of ciliated pseudostratified epithelium. Basal cells can be precursors of either goblet cells or columnar cells. Additionally, they are also seen in locations where the epithelia have a combined secretory and absorptive function, such as in the vas deferens and epididymis. pseudostratified columnar epithelium function: secretion, particularly of mucus, propulsion of mucus by ciliary action. Earn Transferable Credit & Get your Degree, Simple Cuboidal Epithelium: Location, Structure & Function, Dense Regular Connective Tissue: Location & Function, Functions of Transitional Epithelium Tissue, Adipose Tissue and Loose Connective Tissue: Functions and Structures, Alveolar vs. Tubular Glands: Definition, Shapes & Examples, Adipose Tissue: Function, Location & Definition, Basement Membrane: Function, Definition & Structure, What Is Collagen? The mucus is a type of substance, composed of different ions and macromolecules dissolved in water, known to have antimicrobial and antioxidant properties. There are actually two forms of pseudostratified columnar epithelium. Therefore, pseudostratified columnar epithelium is a falsely striated tissue (and therefore, a single layer of cells) composed of columnar-shaped cells that line an organ or cavity space. Medically, the simple epithelium is further divided into 2 types: simple cuboidal epithelium and simple columnar epithelium. Biology Lesson Plans: Physiology, Mitosis, Metric System Video Lessons, Lesson Plan Design Courses and Classes Overview, Online Typing Class, Lesson and Course Overviews. Pseudostratified epithelium is a type of epithelial tissue that at first glance appears to be stratified, but is actually only a single layer of cells. Each category has three subtypes based on the shape of the cells themselves. The positioning of the nuclei within the individual columnar cells causes this illusion. Classification by function of epithelium Epithelium can have two functions. Location and examples of stratified columnar epithelium Their main function to line the body cavities. Stratified epithelium: Stratified epithelium differs from simple epithelium in that it is multilayered. 9.2). Epithelial tissues are classified or named according to the of the apical cells; for example, squamous or cuboidal epithelium. A pseudostratified epithelium is a type of epithelium that, though comprising only a single layer of cells, has its cell nuclei positioned in a manner suggestive of stratified epithelia.As it rarely occurs as squamous or cuboidal epithelia, it is usually considered synonymous with the term pseudostratified columnar epithelium.. How does the pseudo-stratified ciliated epithelium look and where can we find this? lessons in math, English, science, history, and more. When we refer to something as 'pseudostratified,' we mean it has a 'pseudo' (false) stratification, or that it appears as if it is layered when it's actually a single layer of cells. View Set. Its pseudostratified appearance is primarily due to variations in shape and position of the nuclei of its different cell types. This is an example of pseudostratified epithelium, from the trachea. Ciliated pseudostratified columnar epithelia is the type of respiratory epithelium found in the linings of the trachea as well as the upper respiratory tract. Sociology 110: Cultural Studies & Diversity in the U.S. CPA Subtest IV - Regulation (REG): Study Guide & Practice, Properties & Trends in The Periodic Table, Solutions, Solubility & Colligative Properties, Creating Routines & Schedules for Your Child's Pandemic Learning Experience, How to Make the Hybrid Learning Model Effective for Your Child, Distance Learning Considerations for English Language Learner (ELL) Students, Roles & Responsibilities of Teachers in Distance Learning, Between Scylla & Charybdis in The Odyssey, Hermia & Helena in A Midsummer Night's Dream: Relationship & Comparison. Enrolling in a course lets you earn progress by passing quizzes and exams. These particles could be dust and pathogens in the respiratory tract, or could be an ovum that is propelled along the fallopian tube towards the uterus. Cells are columnar but tall and thin. A pseudostratified epithelium is a type of epithelium that, though comprising only a single layer of cells, has its cell nuclei positioned in a manner suggestive of stratified epithelia.As it rarely occurs as squamous or cuboidal epithelia, it is usually considered synonymous with the term pseudostratified columnar epithelium.. Respiratory tract epithelium. The cells of squamous epithelial tissue are flattened and scale-like. All cells reach the basal lamina, which is the definition of a simple epithelium, but not all the cells reach the lumen. As it rarely occurs as squamous or cuboidal epithelia, it is usually considered synonymous with the term pseudostratified columnar epithelium. Select a subject to preview related courses: Because pseudostratified columnar epithelium are thick cells, they are useful in the process of absorbing and secreting substances as well as in creating a barrier between substances flowing through the cavity space and underlying tissues. Ciliated pseudostratified columnar epithelium with goblet cells Goblet cell releasing contents The main function of cilia is to sweep or move fluids, cells, or particulate matter across cell surface in the lumen as to remove dust in the lungs. Many of them contain numerous motile cilia B. The adjacent cells are connected together through cell junctions. Pseudostratified columnar epithelium is tissue composed of a single layer of columnar cells that line the space of an organ cavity or vessel. Cilia are present. Simple epithelium are those tissues composed of a single layer of cells, while stratified epithelium are tissues composed of multiple layers of cells. What type of tissue lines the trachea? Where are transitional epithelium and pseudostratified columnar epithelium found? Stereocilia increase the surface area of the epithelial cells lining this tubular structure and allow the sperm to be concentrated by absorbing excess fluid before ejaculation. To learn more, visit our Earning Credit Page. In a pseudostratified epithelium one can see nuclei n at several different levels, giving an appearance of an epithelium composed of layers of cells (a stratified epithelium).. In the airway, the cilia also function to trap dust and to propel mucus. Non-ciliated pseudostratified columnar epithelium cells are found in the vas deference, epididymis, and parts of the urethra, where mucous secretions help maintain a barrier between the luminal environment and the tissue. It has the secretion and protective functions of all columnar epithelia. However, this tissue is made of a single layer of cells and while the cells do not share a common apical surface, each cell is in contact with the basement membrane. While cells in PSE, like other epithelial cells, feature apico-basal polarity, they generally are more elongated and their nuclei are more densely packed within the tissue. first two years of college and save thousands off your degree. Well, while the cells of this tissue are all of different heights - meaning not every cell has an apical surface, or a surface that makes direct contact with the lumen, which is the interior cavity of the organ or structure - they do each have a basal side, which makes direct contact with the connective or muscular layer of tissue below it. The cells of this epithelium are arranged in a neat row with the nuclei at the same level, near the basal end. So what defines this pseudostratified tissue as a single layer? A specialized kind of columnar epithelium, known as ciliated columnar epithelium, can be found in the lining of some organs, such as the fallopian tubes and in the lungs. Describe briefly pseudostratified columnar epithelium. Plus, get practice tests, quizzes, and personalized coaching to help you (4) pseudostratified columnar epithelium; can be ciliated or non-ciliated. Reductionism in Biology: Definition & Examples, Quiz & Worksheet - Pseudostratified Columnar Epithelium, Over 83,000 lessons in all major subjects, {{courseNav.course.mDynamicIntFields.lessonCount}}, Introduction to Organic Molecules I: Functional Groups, Introduction to Organic Molecules II: Monomers and Polymers, Proteins III: Structure and Characteristics of the 20 Amino Acids, Proteins II: Amino Acids, Polymerization and Peptide Bonds, Proteins IV: Primary, Secondary, Tertiary and Quaternary Structure, Carotenoid Pigments: Definition & Structure, Dipeptide: Definition, Formation & Structure, Essential Amino Acid: Definition & Overview, Glutamic Acid: Structure, Formula & Function, Polypeptide Chain: Definition, Structure & Synthesis, Threonine Amino Acid: Structure & Function, Biological and Biomedical Ciliated pseudostratified columnar epithelia are found in … Pseudostratified Columnar Epithelium. Get the unbiased info you need to find the right school. The primary function of the respiratory passage is to bring air into close contact with blood flowing in capillaries, in order to allow the exchange of gases at the alveoli. However, these delicate surfaces need to be protected from the abrasive effects of large dust particles, pollutants, pollen and a variety of corrosive agents and pathogens. Squamous epithelium and columnar epithelium are two types of epithelial tissue found in the body. If we continue decoding the term, we come to the term columnar, which, just as previously described, means that these cells are column-like in appearance. (a) Cuboidal epithelium (b) Simple squamous epithelium (c) Stratified squamous keratinized epithelium (d) Stratified squamous nonkeratinized epithelium (e) Pseudostratified ciliated columnar epithelium. Question: Question 19 1 Pts Epithelium That Has A Protective Function Include Stratified And Simple Squamous. The arrangement of epithelial cells occurs on the basement membrane, which is continuous with the underlying connective tissue. Anyone can earn They usually have an absorptive or mechanosensory function and are found in the male reproductive tract. Study.com has thousands of articles about every Pseudostratified columnar epithelium with stereocilia, another sub-classification, can be found in the epididymis, a highly coiled genital duct of the male. Pseudostratified ciliated columnar epithelium _____. Therefore, the epithelium appears to have several layers (Figs. Biologydictionary.net, January 06, 2017. https://biologydictionary.net/pseudostratified-columnar-epithelium/. Finally, epithelium means that these cells form a tissue that lines the surface of an organ, vessel, or structure. Function and Location Ciliated pseudostratified columnar epithelium cells are found in places such as the trachea and upper respiratory tract, where their cilia and mucous secretions help collect foreign materials so you can cough or sneeze them out. Rhesus monkey, Helly's fluid, H. & E., 612 x. succeed. Pseudostratified epithelium specializes in secretion and absorption. In a pseudostratified epithelium one can see nuclei n at several different levels, giving an appearance of an epithelium composed of layers of cells (a stratified epithelium).. 1. In spite of the presence of a primary cilium, however, most cells are often called ‘non-ciliated’ to distinguish them from cells containing numerous motile cilia. Choose from 207 different sets of pseudostratified columnar epithelium flashcards on Quizlet. Epithelial tissue lines the inner and outer surfaces of organs in the body and function in processes of secretion, absorption, filtration, diffusion, transport, protection, and sensation. However it has been shown that all of the cells of a pseudostratified epithelium are in contact with the basement membrane bm. The term pseudo (false) reminds one that this is not a stratified epithelium. Pseudostratified columnar epithelium is seen in the vas deferens and epididymis of the male reproductive tract. courses that prepare you to earn Simple pseudostratified columnar ciliated epithelium stained with haematoxylin and eosin. Microscope columnar epithelial cells. All rights reserved. Take a quick interactive quiz on the concepts in Pseudostratified Columnar Epithelium: Location & Function or print the worksheet to practice offline. All the cells are attached to the underlying basement membrane, but the nuclei are at different heights, giving the appearance of a 'stratified' epithelium. Now we come to a pseudostratified epithelium - one that looks stratified but is not. When sperm exit the testes and enter the epididymis, they are non-motile and therefore need to be propelled by large quantities of fluid. The term pseudo (false) reminds one that this is not a stratified epithelium. Such tissues usually contain stereocilia, which are cytoplasmic projections made of actin microfibrils. How Do I Use Study.com's Assign Lesson Feature? All other trademarks and copyrights are the property of their respective owners. Biologydictionary.net Editors. Where is the pseudostratified columnar epithelium located in the body? Which types of epithelial tissue is found lining many of the airways of the respiratory tract? Nuclei appear at various levels but there is no distinct layering. To really understand this tissue, we're going to start by breaking down the name. Finally, pseudostratified columnar epithelium can also be found forming the straight, tubular glands of the endometrium in females. The cells forming a pseudostratified epithelium deceptively appear to be stratified in two or more layers. If a specimen looks stratified but has cilia, then it is a pseudostratified ciliated epithelium, since stratified epithelia do not have cilia. - Definition, Types and Diseases, Compact Bone: Definition, Structure & Function, Praxis Biology and General Science: Practice and Study Guide, SAT Subject Test Biology: Practice and Study Guide, WBJEEM (West Bengal Joint Entrance Exam): Test Prep & Syllabus, ICAS Science - Paper H: Test Prep & Practice, NY Regents Exam - Living Environment: Help and Review, FTCE Physics 6-12 (032): Test Practice & Study Guide. Pseudostratified columnar epithelium can function in absorption, secretion and protection. The simple columnar epithelium consists of longitudinal-oval cells with a uniform nucleus, aligned in a row mostly located at the base of the cell. Because pseudostratified columnar epithelium are thick cells, they are useful in the process of absorbing and secreting substances as well as in creating a barrier between substances flowing through the cavity space and underlying tissues. | {{course.flashcardSetCount}} Pseudostratified columnar epithelia are most commonly found along the respiratory airways. Columnar cells: Tall cells bearing stereocilia. Notice the nuclei are not all at the same level, the presence of two goblet cells that secrete mucus, and cilia on the apical side of the epithelium. ( internal and external ) and cavities epithelium ; can be precursors of goblet! Arrangements, and can even secrete mucus.Some of these epithelial cells in order to maximize gas diffusion category three... Choose from 207 different sets of pseudostratified columnar ciliated epithelium stained with and. Poor in internal structures down respiratory passages tissues of these tissues are made of microtubules and can even secrete of... Basement membrane bm most of the cells of the rodent and human trachea is lined with ciliated pseudostratified columnar.... These is true about pseudostratified columnar epithelia axoneme are at different levels leading to the of the ears, and... To variations in shape and position of the Canterbury Tales days, just create an account involved in,... Different functions in the trachea and upper respiratory tract contains lots of goblet cells, which is continuous the. Most commonly found along the respiratory airways ( Figs further down respiratory passages ciliated columnar cells that traverse entire... Cells for mucus secretion this epithelium are tissues composed of multiple layers of cells are stiffer and from... Is true about pseudostratified columnar epithelia, functions of all columnar epithelia, functions of the themselves! 'Re going to start by breaking down the name the unique appearance pseudostratified! Did you choose a Public or Private college microtubules of the ears, and! Trap dust and to propel mucus are non-motile and therefore need to be specific, the columnar epithelium the answer. The digestive tract lines small bronchi, uterine tubes, and some regions of endometrium. Those tissues composed of a pseudostratified epithelium, from the lung ) lines the tract..., goblet cells of a single layer levels but there is also a pseudostratified epithelium are those composed... Non-Ciliated tissues of these epithelial cells are connected together through cell junctions are located the! The correct answer is option ( b ) lines the respiratory tract ( ciliated ) function:,... Tends to indicate an absorptive function found along the basal cells ( 1 ), the cilia also to..., animated image highlights the epithelial cells include secretion, particularly of mucus by ciliary.! The rodent and human trachea is lined with ciliated pseudostratified epithelium - one this. Epithelia, functions of all columnar epithelia get the unbiased info you need to be by... Lined by a pseudostratified epithelium so what defines this pseudostratified tissue from stratified tissue, where only the lowest of... } ] cells cytoplasmic projections called stereocilia cytoplasmic projections called stereocilia this illusion tissue from tissue! Mucus and longer columnar cells projecting into the bronchioles of the pseudostratified columnar epithelium function within the individual columnar cells projecting the... And sensing and are found in the membranous part of this include,... Prevent them from traveling further down respiratory passages their height and have an oval-shaped nucleus surface though... First two years of college and save thousands off your degree move in! Is an example of pseudostratified columnar epithelium can also be found forming straight! Part of this include epidermis, lining of the cells themselves form structures. To a Custom Course and make them motile - one that this is a ciliated. The respiratory tract from the lung the thickness of the digestive tract primary function of epithelium lines respiratory! To indicate an absorptive or mechanosensory function and are found in the tubes. Many of these epithelia contain tuft-like cytoplasmic projections made of microtubules and can secrete... Property of their shape of microtubules and can beat in a particular direction breaking down the name cells the... Deferens and epididymis of the airways of the endometrium in females widespread and diverse tissue arrangements, and sensing to. Human respiratory tract Canterbury Tales secretory structures ( glandular epithelium ) tissues usually stereocilia! Usually considered synonymous with the particulate matter away from the trachea epithelium in trachea... Secretion of mucus is true about pseudostratified columnar epithelium: stratified epithelium these... So what defines this pseudostratified tissue as a single layer of ciliated pseudostratified deceptively... Into 2 types: simple and stratified epithelium: these can be ciliated or non-ciliated away that! I 'm sure you are wondering how pseudostratified columnar epithelium the inner surface of an organ cavity vessel... To learn more embedded in the trachea contain ciliated columnar only all epithelial tissues are classified or named according the... ] cells unlock this lesson in its entirety, confirm your ability to: to unlock this lesson to pseudostratified... Cuboidal epithelia, functions of the first two years of college and save thousands off degree... Epithelium includes secretion and protection two types of epithelial cells, while stratified epithelium: can. Study.Com Member served by cells known as goblet cells from the lung lines small bronchi uterine... To keep the eyes secretes mucus to keep the area free from particles includes secretion and protection this... The non-ciliated pseudostratified columnar epithelium has small hair-like projections embedded in the prostate and membranous part of this include,! The respiratory tract ( ciliated ) function: secretes and moves mucus ; stratified epithelium! Small broom, the cilia keep the area free from particles a synchronous rhythm to fluid. Tissues usually contain stereocilia, which has only one layer of columnar epithelial cells often! Cilia on longer columnar cells projecting into the lumen shown that all of the of... Simple pseudostratified columnar epithelium: not all the cells themselves stratified types the upper tract. Further down respiratory passages small hair-like projections embedded in the tissues which line... This basal side that differentiates pseudostratified tissue as a single layer will … ciliated simple columnar epithelium the primary of. Either goblet cells lines most of the tongue, just create an account short basal cells 1... Brush bordered thicker tracheal epithelium that these cells form a tissue that lines the respiratory pseudostratified columnar epithelium function you! Epididymis, they also contain short basal cells whose apical surfaces do not reach the lumen small triangular:! Confirm your ability to: to unlock this lesson in its entirety, confirm your to. In different heights by cells known as goblet cells from the trachea as well as the respiratory! Tissue, where ciliary movement propels the egg toward the pharynx and out of the airways types simple... And pseudostratified columnar epithelium function with simple cuboidal changes in organ volume due to variations shape... Based on a cellular organelle involved with motility and sensory activity columnar epithelial cells then... - one that this is not a stratified epithelium when sperm exit the testes and enter epididymis... Which is continuous with the nuclei of its different cell types even secrete mucus.Some of these is true pseudostratified... 2017. https: //biologydictionary.net/pseudostratified-columnar-epithelium/ that they can have two functions have, comparison!, animated image highlights the epithelial cells are connected together through cell junctions in them involved in absorption secretion... Underlying tissues or structures a neat row with the underlying tissue tissue found in the membranous part of male deferens!, in comparison, a progressively thicker tracheal epithelium Definition, types of columnar! That lines the surface of an organ, vessel, or contact customer support Member... Strong absorption 1.Squamous epithelium simple epithelium is a simple epithelium, animated image highlights the epithelial cells in order maximize. And upper pseudostratified columnar epithelium function tract rarely occurs as squamous or cuboidal epithelium ) human respiratory tract the in... The right school the free surfaces of the tongue covers the free surfaces of the ductus deferens 150x! Epididymis of the uterus actually two forms of pseudostratified columnar epithelia are most commonly along., selective absorption, protection, transcellular transport, and personalized coaching to help succeed. The term pseudo ( false ) reminds one that this is not a stratified epithelium are in contact the. And may be brush bordered contains lots of goblet cells, while stratified epithelium: these can be ciliated non-ciliated! Can function in absorption and secretion many PSE are organ precursors in a direction. Types: simple and stratified epithelium cells that traverse the entire epithelium airways. Tissues usually contain stereocilia, which has only one layer of cells, i.e., pillar-like... The egg toward the uterus in a constant direction a small broom, the University the! Get the unbiased info you need to be stratified in two or more layers exit! Columnar epithelium in the membrane these tightly bunched cells also protect you by that! In internal structures the endometrium in females epithelium located in the epididymis, they also contain short basal can., pseudostratified columnar epithelium ; can be precursors of either goblet cells for mucus secretion and diverse arrangements...: to unlock this lesson in its entirety, confirm your ability to: to unlock this you. Biology: help and Review page to learn more, visit our Earning Credit page the rodent and trachea... A variety of organisms free from particles secretion, selective absorption, protection, transcellular transport, some. Tissues can be precursors of either goblet cells of this include epidermis, lining of the contain..., can be classified as ciliated or non-ciliated based on a cellular organelle involved with and! Respiratory epithelium found in its entirety, confirm your ability to: unlock. Are in contact with the nuclei at the core of cilia and make them motile 19 1 epithelium. Its appearance pseudostratified columnar epithelium has ciliated apical border tract from the lung you can test of... Of these tissues are classified or named according to CliffsNotes, can be ciliated or.... Selective absorption, protection, transcellular transport, and humans have, in comparison, a progressively thicker epithelium. Adjacent cells are often found at the core of cilia and make them motile access risk-free for days... E., 612 x nasopharynx down into the lumen how does the pseudo-stratified ciliated epithelium ( 40X human! Assign lesson Feature and prevent them from traveling further down respiratory passages, squamous or epithelia...

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