chapter 1: epithelium background

Question 1

General fxns of epithelium

Answer 1

absorption
secretion
provide barrier

Question 2

Specialized fxns of epithelium

Answer 2

transport molecules across epithelium
prevent transport of materials across epithelium (selective permeable)
sensory

Question 3

basic characteristics of epithelium

Answer 3

cells adjacent to one another

associated with complete OR partial basement membrane

Question 4

2 parts of basement membrane

Answer 4

basal lamina

reticular lamina

Question 5

basal lamina produced by

Answer 5

epithelium

Question 6

reticular lamina produced by

Answer 6

fibroblasts in CT

Question 7

partial basement membrane is composed of

Answer 7

basal lamina only

Question 8

functions of basement membrane

Answer 8

provide surface for epithelial cell attachment
molecular filter
limits stretch
directs migration of cells

Question 9

epithelium is _______, cells obtain nutrition via ______

Answer 9

avascular

diffusion

Question 10

CT is associated with epithelium and provides:

Answer 10

nutrition

source of defensive cells

Question 11

tight junction

Answer 11

zonula occludens

Question 12

junction that involve the sharing of intrinsic membranes between adjacent cells

Answer 12

zonula occludens

Question 13

junction that provides strong attachment and PREVENTS passage of material between cells

Answer 13

zonula occludens

Question 14

adhesion belt

Answer 14

zonula adherens

Question 15

junction that consists of regions of:

• cadherins
• marginal bands (microfilaments): attach cytoskeleton to cell membrane at these areas

Answer 15

zonula adherens

Question 16

junction that provides strong attachment and cell structural stability

Answer 16

zonula adherens

Question 17

junction that provides strong attachment

Answer 17

macula adherens

Question 18

six connexins (proteins) arranged in cylinder. size of opening is controlled by cell

Answer 18

gap junctions

Question 19

junction with functions: strong attachment & transport material between cells

Answer 19

gap junctions

Question 20

Junctional complex is in simple epithelium in the following order w. the free cell surface:

Answer 20

zonula occludens
zonula adherens
macula adherens

Question 21

help to connect epithelial cells to the basal lamina; 1/2 desmosome

Answer 21

hemidesmosome

Question 22

integrin binds to structural CT glycoproteins and also connects to cytoskeleton

Answer 22

focal point contacts