Epithelia

Question 1

What are the three varieties of epithelia based on number of layers?

Answer 1

Simple (single layer) stratified (multi layer) pseudostratified (appear multi, actually simple)

Question 2

What are the three varieties of epithelia based on shape of cells?

Answer 2

Squamous epithelia: flat outermost layer
Cuboidal epithelium: cells that are as tall as they are wide.
Columnar epithelium: cells are taller than they are wide

Question 3

What are microvilli?

Answer 3

small processes that project from the apical surface of most types of epithelial cells, particularly intestine and kidney tubule

Question 4

What are stereocilia?

Answer 4

unusually long, non-motile microvilli that are found on the surface epithelium in the epididymis and ductus deferens.

Question 5

What are cilia?

Answer 5

actively motile processes with a complex internal structure found on the epithelial lining of the respiratory tract and the female reproductive tract

Question 6

What proteins are found in tight junctions?

Answer 6

Claudins and occludins

Question 7

What proteins are found in adhering junctions?

Answer 7

Cadherins

Question 8

What proteins are found in gap junctions?

Answer 8

connexins

Question 9

What are the primary molecular components of basement membranes?

Answer 9

Glycoproteins and proteoglycans

Question 10

Where are integrins found?

Answer 10

Hemidesmosomes

Question 11

What is the function of hemidesmosomes?

Answer 11

To anchor cells to the basement membrane