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Flashcards in Chap 1 Part 1 Deck (67)
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1

What are the 3 general function of epithelium?

absorption, secretion and providing a barrier

2

What are the 3 specialized functions of epithelium?

transport molecules across epi, selective permeability, and sensory

3

T/F: epithelial cells being adjacent to each other is a characteristic shared among all types of epithelium.

True

4

What are the two types of basement membranes that epithelial cells are associated with?

either complete or partial basement membranes

5

What are the parts of a complete basement membrane?

basal lamina and reticular lamina

6

What are the parts of a partial basement membrane?

basal lamina only

7

What produces the basal lamina?

epithelial cells

8

What produces the reticular lamina?

fibroblasts in connective tissue

9

What are the 3 main functions of a basement membrane?

provides a surface for epithelial cell attachment, molecular filter, and limits stretch

10

T/F: collagen I fibers can stretch.

false; this how basement membranes limit stretch

11

T/F: epithelium is directly supplied by blood vessels.

False; epithelium is avascular and cells obtain nutrition by diffusion

12

What are the 2 functions of CT?

provides nutrition and source of defensive cells

13

What are epithelial cells held together by?

cell junctions

14

What are the 4 types of cell junctions?

Zonula Occludens, Zonula Adherens, Macula Adherens, and Gap Junctions

15

Which type of cell junction is considered a tight junction?

Zonula Occludens

16

Which type of cell junction involves sharing of intrinsic membrane proteins between adjacent cells?

Zonula Occludens

17

What are the two functions of the Zonula Occludens?

Provide strong attachment and prevent passage of material between cells

18

Which type of cell junction can be considered and adhesion belt?

Zonula Adherens

19

Which type of cell junction consists of cadherins and marginal bands?

Zonula Adherens

20

What are cadherins?

Linkage proteins between cells

21

What are marginal bands?

microfilaments which attach the cytoskeleton to the cell membrane

22

What are the two functions of the Zonula Adherens?

strong attachment function and provide cell structural stability

23

Which cell junction is essentialy just desmosomes?

Macula Adherens

24

What is the function of the macula adherens?>

strong attachment

25

Which type of cell junction consists of six connexins arranged in a cylinder?

Gap junctions

26

What are connexins?

proteins; a complete structure

27

What are the 2 functions of Gap Junctions?

strong attachment, and transport materials

28

Which types of cell junctions function is providing a strong attachment?

All 4

29

What is the Junctional Complex?

Zona Occludens, Zona Adherens, and Macula Adherens

30

Hemidesmosomes and focal point contacts are junctions that do what?

hold the epithelium to the basement membrane and the CT below