Epithelial Tissue Flashcards
Cells are _____ with little _____
Polyhedral, interstitial space
Covers the _____ layer of the skin
outermost
Covers the _____ layer of most organs/cavities
innermost (lungs, GI tract, urinary tracts, reproductive tracts)
One side is always exposed to:
body exterior
organ tract or cavity
Makes up the ____ and _____ glands
Exocrine, Endocrine
Exocrine gland def/ex
Excreting: sweat, digestive, mammary
Endocrine gland def/ex
Hormones: thyroid, pancreas, adrenal cortex
Cells have high ______ ______ but are ______
regeneration potential, avascular
rely on perfusion for O2 supply
Basement Membrane
basal lamina & reticular lamina
many epithelial cells rest on it
Basal Lamina
flat “sheets” of nonliving adhesive-like collagen and glycoprotein
secreted by epithelial cells
Reticular Lamina
“foundation” for basal lamina
Hemidesmosomes
Function in cell signaling (proliferation, apoptosis)
Simple
Squamous
Cuboidal
having a single layer of cells
Flat Cells
Cells as tall as they are wide
Columnar
Stratified
Transitional
Ciliated
Tall and column shaped
having stacked layers
“dome” surface cells (capable of stretching)
cilia on the exposed surface
Simple Squamous Epithelium
Permeable cells structure for filtration and gas exchange
Ex: capillaries, alveoli, kidney glomeruli
