08.24.10_Flash_Cards_Epithelia.csv

long intertwining processes; no ECM

aggregated polyhedral cells; small amount of ECM

elongated contractile cells; moderate amounts of ECM

several types of fixed and motile cells; extensive ECM

tissue compose of the cells responsible for the main functions of an organ

supporting tissue

• covering, lining, & protection; absorption;
• secretion; contractility

found outside the basal lamina in the epithelial layers of internal organs; the layer of connective tissue on which epithelial tissue rests; supports epithelium and binds to underlying layers

small evaginations that increase the area of contact between the lamina propria and the epithelium; most common in areas subject to high friction

the side of the epithelial cell that faces toward the connective tissue

the side of the epithelia opposite the basal pole

intervening sides of an epithelial cell that lie apposed to other cells

a sheet of felt-like material that lies at the base of epithelial cells

the electron-dense layer of the basal lamina; made up of network fibrils

another name for the lamina densa

"""clear layers"" sometimes found on either side of the lamina densa; part of the basal lamina"

another name for the laminae lucida

formed by the combination of a basal lamina and a reticular lamina; visible under a light microscope

a type of intercellular junction that serves to prevent the flow of material between cells; found at the most apical part of the cell

a type of intercellular junction that serves to adhere cells to each other; encircles the cell; mediated by cadherins; involves actin

a type of intercellular junction that allows for communication between cells; mediated by connexons

also known as zona occludens; occluding junctions

also known as tight junctions; occluding junctions

transmembrane glycoproteins that enable adhesion between cells in the presence of calcium

also known as adherent junction

adhesive structures that bind the epithelial cell to the basal lamina; resemble half of a desmosome except that they contain integrins instead of cadherins as adhesive proteins

"a type of intercellular junction that serves to adhere cells to each other; does NOT encircle the cell; disk-shaped; utilizes cadherins

also known as a desmosome

dumbell-shaped protein subunits of connexons; six connexins form a connexon

abutting particles of a gap junction; composed of connexins

actin-based, non-motile cellular protrusions that increase the surface area of a cell

actin-based, non-motile cellular protrusions; similar to microvilli but larger; differ from actual cilia in their composition and lack of motility

motile cellular protrusions; powered by dynein or other motor proteins; composed of microtubules; larger than microvilli; propel fluid

contain only one layer of cells

contain more than one layer of cells

epithelial cells that are taller than they are wide; have oblong nuclei; involved in absorption and processing

epithelial cells that are roughly as tall as they are wide; have circular nuclei; often have many mitochondria for active transport; usually involved in secretion and absorption

simple epithelial cells that appear stratified due to nuclei of different heights; almost exclusively found in the large airways of the respiratory tract

line moist tissues that are subject to abrasion

found in sweat and salivary glands; provides a lining that is more robust than simple stratified epithelium; involved in protection and secretion

"found in the mammalian urinary tract; characterized by dome-like ""umbrella"" cells; protect against potentially cytotoxic effects of urine"

found in skin; provides a barrier to abrasion and dessication

a cytoskeletal element composed of actin filaments; found at the apical side of the cell

thin, flat layer of epithelial cells; typically line vessels and cavities; usually involved in selective diffusion