L2: Epithelia Flashcards
1
Q
where is epithelial tissue found?
A
- forms covering of body surfaces
- lines hollow organs, cavities and ducts
- forms the glands of the body
2
Q
what are the key functions of epithelial tissues?
A
- selective barriers (limit or aid transfer)
- secretory (onto a free surface)
- protective (especially from abrasion)
3
Q
the cells of an epithelium are…
A
- arranged in continuous sheets as single or multiple layers
- held together by a variety of cell junctions
4
Q
what are the different types of cell junctions?
A
- tight
- adherens
- desmosome
- hemidesmosome
- gap
5
Q
what are the different surfaces of epithelial cells?
A
- apical
- basal
- lateral
6
Q
what is the function of microfilaments in the cytoskeleton?
A
- bundles beneath cell membrane and cytoplasm
- strength, alter cell shape; link cytoplasm to membrane; tie cells together; muscle contraction
7
Q
what is the function of intermediate filaments in the cytoskeleton?
A
strength
8
Q
what proteins are involved in tight junctions?
A
claudins and occludins
