Epithelium

Question 1

Transcytosis (transcellular)

Answer 1

Ions and stuff passing through epithelial cells

Question 2

Paracellular pathway

Answer 2

Ions and stuff passing between the cells through tight junctions

Question 3

Classification of epithelium is defined by:

Answer 3

Shape of cell at the surface of the epithelial layer (lining the lumen)

Question 4

Mucus glands

Answer 4

Secrete thick, sticky stuff

Appear pale on staining

Question 5

Serous glands

Answer 5

Secrete thin, watery stuff

Appear dark on staining

Question 6

Goblet cells

Answer 6

Unicellular glands

Question 7

Multicellular glands

Answer 7

Composed of many cells

Question 8

Exocrine glands

Answer 8

Have duct system, can be branched or not

Question 9

Endocrine glands

Answer 9

Don’t have duct system, empty straight into bloodstream.

Question 10

Basement membrane

Answer 10

Provides attachment for epithelial cells
Consists of two components, basal lamina and reticular lamina
(Lamina Lucida may be an artifact)

Question 11

Basal lamina (aka lamina densa)

Answer 11

Type IV collagen

Question 12

Reticular lamina

Answer 12

type III collagen

Sits below the lamina densa, further away from the epithelial cell

Question 13

True cilia

Answer 13

Orderly arrangement and synchronized movement
9+2 micro tubule pairing
Dynein motor protein uses ATP cleavage to produce energy and move
Move mucus out of lungs
Flagella are motile tail of sperm
Defect leads to bad lungs and infertility (Cystic fibrosis)

Question 14

Microvilli

Answer 14

Cap luminal surface of intestinal cells
Increase surface area for absorption
Core of actin filaments
Villain anchors actin filaments at the tip

Question 15

Stereocilia

Answer 15

Actually are long Microvilli, actin filaments core
Only found in three places: epididymis, ductus deferens, inner ear
Connected by cytoplasmic bridges