Chapter 1.03 Flashcards
What are the three surfaces of epithelial cells
apical
lateral
basal
what is the layer that the basal surface attaches to with underlying CT?
basement membrane
What does it mean by Epithelial cells being Avascular
has no blood vessels but has its own nerve supply
What are the three anchoring junctions?
Adherens junctions
Desmosomes- side
Hemidesmosomes- on bottom
what are the communication juctions of epithelial cells
gap junctions
what are the occluding junctions in epithelial cells
tight junctions- top
this describes what junctional complex: Holds cells together sealing between
cells, forming a diffusion barrier that
encircles the cell.
occluding:tight junctions
Give description of Anchoring junctional complexes adheren junction
location: inferior
Importance- lateral adhesion
reach into cell to connect adj. cells
stablize
encircle cell
Give description of desmosomes
provide spot-like adhesions b/w epithelial
stong attachment but DONT encircle cell
give description of gap junctions
allow diffucion across the cell
dont anchor to the cytoskeleton
give description of hemidesmosomes
found on basal surface
Transmembrane protiens anchor to intermediatefilaments and basal lamina
What is the basement membrane
This extracellular structure consisting of two layers
Collagen 3 and 4
function of epithelial tissue
Stratified squamous
Mechanical protection- skin
Function of epithelial tissue
Simple squamous
diffusion/lubrication-lungs
function of epithelial tissue
simple cubodial
absorption/secretion- kidney, glands
function of epithelial tissue
transitional epithelial
stretch- urinary bladder
function of epithelial tissue
Myoepithelial
contractibility- glands
function of epithelial tissue
psuedostratified
sensation/receptors- nasal
True or false: Epithelial have reapid regeneration and replacement of cells but life spans vary throughout the body
true
