Functions and Classification of Epithelium Quiz

Tight junctions = Fuse adjacent plasma membranes together like a zipper Adhesion junctions (Desmosomes) = Anchoring junctions that prevent cells from being pulled apart Gap junctions = Allow communication between cells Hemidesmosomes = Serve as stable anchorage at the basal part of epithelial cells

Desmosomes = Found in the walls of epithelial cells Hemidesmosomes = Found at the basal part of epithelial cells Apical surface = Always has one free surface exposed to the body exterior or cavity of an internal organ Basal surface = The lowermost surface portion of epithelium

Microvilli = Fingerlike extensions of the plasma membrane that increase surface area, common in tissues that absorb and secrete substances Cilia = Hairlike projections commonly found in the lining of trachea and other internal tracts, propel substances along the epithelial surface Smooth & slick surfaces = Some exposed surfaces are smooth and slick without modifications Exposed surfaces with microvilli or cilia = Exhibit modifications to increase functionality such as absorption or propulsion

<p>Protection = Epithelium that protects against mechanical, chemical, and bacterial factors Absorption = Epithelium found in the digestive tract that absorbs nutrients Filtration = Epithelium in the kidneys that filters waste products Secretion = Epithelium specialized in glandular secretion</p> Signup and view all the answers

<p>Squamous = Flattened, scalelike, and horizontal cells Cuboidal = Cube-shaped cells with a centered nucleus Columnar = Column-like and vertically oriented cells Pseudo-columnar = Cells not anchored to the base membrane and arranged in a columnar shape</p> Signup and view all the answers

<p>Simple = Epithelium consisting of a single layer, often involved in absorption and filtration Stratified = Epithelium with multiple layers, typically found in high abrasion areas for protection Polyhedral = Irregularly shaped epithelial cells in cross-section Multiple layers = Characteristic of stratified epithelial tissue</p> Signup and view all the answers

<p>Class 1 = Function 1 Class 2 = Function 2 Class 3 = Function 3 Class 4 = Function 4</p> Signup and view all the answers

<p>Basement membrane = Attachment point for epithelial cells at their basal surface Polarity = Distinct apical and basal surfaces of epithelial cells Cellularity = Characterized by being closely packed without intercellular spaces Specialized contacts = Structures that join adjacent epithelial cells together</p> Signup and view all the answers

<p>Digestive tract = Absorption function Kidneys = Filtration function Glands = Secretion function High abrasion areas = Protection function</p> Signup and view all the answers

<p>Simple squamous epithelium = Absorption and diffusion Simple cuboidal epithelium = Secretion and absorption Simple columnar epithelium = Absorption and secretion Pseudostratified columnar epithelium = Protection, secretion, move mucus with cilia</p> Signup and view all the answers

<p>Mesothelia lining ventral body cavities = Simple squamous epithelium Lining of stomach, intestine, gallbladder = Simple columnar epithelium Lining of the nasal cavity, trachea, bronchi = Pseudostratified columnar epithelium Glands, ducts, portions of kidneys tubules = Simple cuboidal epithelium</p> Signup and view all the answers

<p>Reduces friction, controls vessel permeability = Simple squamous epithelium Limited protection, secretion, absorption = Simple cuboidal epithelium Protection, secretion, absorption = Simple columnar epithelium Protection, secretion, move mucus w/cilia = Pseudostratified columnar epithelium</p> Signup and view all the answers

<p>Serves as a protective layer against pathogenic microorganisms as well as lubrication = Goblet Cells Cilia movement = Pseudostratified columnar epithelium Styling web pages = CSS Client-side scripting for web applications = JavaScript</p> Signup and view all the answers