1.4

Question 1

2 plasma membrane folds

Answer 1

lateral, basal

Question 2

Extracellular adhesion

Answer 2

cohesion (transmembrane glycoproteins)

Question 3

intercellular jxns (3)

Answer 3

Zonula occludens (tight)
Zonula adherins (int)
Macula adherens (desmosome)

Question 4

Tight junction

Answer 4

close to apical surface
belt-like
prevents passage of materials

Question 5

intermediate jxns

Answer 5

belt-like

no membrane fusion

Question 6

desmosome

Answer 6

disc-shaped
no membrane fusion
tonofilaments inserting
firm adhesion of ADJACENT cells

Question 7

which proteins associate with tight junctions?

Answer 7

ZO1, ZO2, ZO3

Question 8

which cells have abundant desmosomes?

Answer 8

epithelial and cardiac

Question 9

Gap jxns

Answer 9

disc shaped
no membrane fusion
contains CONNEXONS
allows cell-cell communication

Question 10

which cells have gap junctions?

Answer 10

epithelia, muscle, fibroblasts

Question 11

junctional complex has what 3 things?

Answer 11

ZO, ZA, MA

Question 12

Hemidesmosome

Answer 12

CELL-ECM

• dif proteins than desmosome
• tonofilaments

Question 13

Basal lamina

Answer 13

extracellular product of epithelial cells

Question 14

what is basal lamina made of?

Answer 14

type 4 collagen, laminin, entactin, heparan sulfate

Question 15

reticular lamina

Answer 15

deeper, more solid; has anchoring fibrils

Question 16

fxn of basal lamina (8)

Answer 16

support for cells, filtration/diffusion, cell-cell int, polarity, regulate proliferation and differentation, influence metabolism, protein organization, cell migration pathways

Question 17

Epithelia does NOT have _______ but DOES have ______-

Answer 17

blood vessels, nerves

Question 18

basement membrane is made up of what

Answer 18

basal lamina, reticular lamina