Quiz 4 Flashcards
(39 cards)
where is epithelium found in the body
internal and external surface of the body, lines body cavities, and hollow organs
polarity
the membranes always have one free surface (apical surface)
epithelium is supported by
connective tissue
basement membrane is secreted by
basal lamina
avascularity
having no blood supply of their own
high regeneration
easily replace themselves if they are damaged
four functions of epithelial tissue
selective permeability, physical protection, secretion, sensory reception
covering and lining epithelia are categorized by
cell layers and shapes of cells in those layers
simple epithelium
single layer of cells with every cell in direct contact with basement membrane
stratified epithelium
more than one layer, undergoes mitotic division
squamous epithelium
protective functions; protects underlying tissues in areas subjected to abrasion
cuboidal epithelium
single layer of cube-like cells; secretion and absorption
columnar epithelium
single layer of tall cells with oval nucleus; absorption secretion, enzymes
pseudo stratified epithelium
single layer of cells of differing heights, secretion; propulsion of mucus by ciliary action
transitional epithelium
resembles stratified squamous and cuboidal; stretches and permits distension of urinary organ; lines uterus, bladder, and part of urethra
stratified epithelia are named according to cells at the
apical membrane
simple squamous
simplest epithelium; allows passage of materials by diffusion and filtration in sites where protection is not important; secretes lubricating substances in serosae
location of simple squamous
located in kidney glomeruli, air sacs of lungs, lining of heart, blood vessels, lymphatic vessels, lining of ventral body cavity
location simple cuboidal
kidney tubules, ducts and secretory portions of small glands; ovary surface
simple columnar
absorption, secretion of mucus, enzymes and other substances; ciliated type propels mucus (or reproductive cells) by ciliary action
location of simple columnar
non-ciliated type: lines most of the digestive tract (stomach to anal canal), gallbladder, and excretory ducts of some glands
ciliated type: lines small bronchi, uterine tubes, and some regions of the uterus
stratified squamous
thick membrane composed of several cell layers; basal cells are cuboidal or columnar and metabolically active; surface cells are flattened (squamous); in the keratinized type: the surface cells are full of keratin and dead; basal cells are active in mitosis and produce the cells of the more superficial layers
location of stratified squamous
non-keratinized type: forms the moist linings of the esophagus, mouth, and vagina
keratinized type: forms the epidermis of the skin, a dry membrane
location of pseudo stratified columnar
non-ciliated type in male’s sperm carrying ducts and ducts of large glands
ciliated: lines the trachea, most of the upper respiratory tract
