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Terms in this set (71)

a. simple squamous- single layer of flattened cells with disc-shaped central nuclei; sparse cytoplasm
-functions- absorption, secretion, filtration
-locations- in kidney glomeruli- urine formation
walls of alveoli- air sacs in lungs- gas exchange; endothelium - slick, friction-reducing lining in lymphatic vessels, heart lining, & blood vessels; mesothelium - in serous membranes lining the ventral body cavity & covering its organs
b. simple cuboidal- single layer of cube-like cells with large, spherical, central nuclei
-functions- secretion and absorption
-locations-kidney tubules; ducts and secretory portions of small glands; ovary surface
c. simple columnar- single layer of tall cells with round to oval nuclei; some have cilia on apical surface
-functions- absorption; secretion of mucus, enzymes, and the substances
-locations- nonciliated- line most of the digestive tract (stomach to rectum), gallbladder, and excretory ducts of some glands; cilitated- line bronchi, uterine tubes, and some regions of the uterus
d. pseudostratified columnar- single layer of cells of differing heights with some not reaching free surface; nuclei are seen at different levels; false impression of several layers; may contain mums-secreting cells and bear cilia
-fuctions- mucus secretion and propulsion of mucus by cilia
-locations- nonciliated- male sperm-carrying ducts and ducts of large glands; ciliated- line trachea and most of the upper respiratory tract
e. stratified squamous- several layers of cells; its apical cells are squamous and its basal cells are cuboidal or columnar; contain 2 or more layers; basal cells divide and push apically to replace older cells; more durable than simple epithelia
-function- protects underlying areas from abrasion
-locations- keratinized type- skin's epidermis; nonkeratinized type- moist linings of esophagus, mouth, and vagina
f. stratifitied cuboidal- typically has 2 layers of cuboidal cells; rare in the body
-location- ducts of larger glands (sweat and mammary glands)
g. stratified columnar- columnar apical layer; limited distribution in the body
-location- pharynx, male urethra, and lining some glandular ducts; also seen at transition areas or auction between two other types of epithelia
h. transitional- resembles both stratified squamous and stratified cuboidal; cuboidal or columnar basal cells; apical cells vary in appearance depending on degree of urinary organ distension (domelike apical cells flatten and become squamous-like when organ is filled with urine)
-functions- cells flatten to permit urinary bladder distension; allows greater volume of urine to flow through tube-like organ; allows more urine to be stored in bladder
-location- linings of hollow organs (ureters, bladder, and part of urethra)