Chapter One - Epithelium Flashcards Preview

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Flashcards in Chapter One - Epithelium Deck (123)
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0

What are the four basic types of tissue?

Epithelial, muscle, nervous, and connective

1

What are the three general functions of epithelium?

Absorption, secretion, and providing a barrier

2

Which general function of epithelium is a function of ALL epithelium?

Providing a barrier

3

What produces the basal lamina of the basement membrane?

Epithelium

4

What are the three specialized functions of epithelium?

Transfer molecules across epithelium, prevent transfer of materials (aka selective permeability), sensory function

5

What produces the reticular lamina in the basement membrane?

Fibroblasts in connective tissue

6

What are the two parts of the basement membrane of epithelium?

Basal lamina and reticular lamina

7

What makes up a partial basement membrane of epithelium?

Basal lamina ONLY

8

What are the functions of the basement membrane of epithelium?

Providing a surface for epithelial cell attachment, molecular filter (very limited), limits stretch, and directs migration of cells

9

Are epithelial cells vascular or avascular?

Avascular

10

By what process do epithelial cells obtain nutrition?

Diffusion

11

What are the functions of connective tissue?

Provides nutrition (and oxygen), source of defensive cells

12

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

Zonula occludens

13

What is the other name for zonula occludens?

Tight junction

14

What are the functions of zonula occludens (tight junctions)?

Provides strong attachment, prevents the passage of materials between cells

15

Zonula adherens consist of what?

Cadherins (linkage proteins) and marginal bands (microfilaments)

16

What part of the zonula adherens are located between cells?

Cadherins

17

What is the other name for zonula adherens?

Adhesion belt

18

What part of the zonula adherens attach the cytoskeleton to the cell membrane?

Marginal bands

19

What are the functions of the zonula adherens?

Strong attachment and provide cell structural stability

20

What is another name for macula adherens?

Desmosome

21

What is the function of macula adherens?

Provides strong attachment

22

What are the three parts of the macula adherens?

Transmembrane proteins, protein plaque, and tonofilaments

23

Which type of cell junction is arranged in a cylinder with six connexins (proteins)?

Gap junctions

24

What are the two functions of gap junctions?

Strong attachment, transport materials between cells

25

What makes up the junctional complex (in order)?

Zonula occludens, zonula adherens, macula adherens

26

What junctions hold the epithelium to the basement membrane and the connective tissue below?

Hemidesmosomes and focal point contacts

27

What is the function of hemidesmosomes?

Helps connect epithelial cells to the basal lamina (essentially half a desmosome)

28

What is bullous pemphigoid?

An autoimmune skin disease causing large blistering lesions that burst but do heal

29

What is pemphigus vulgaris?

An autoimmune skin disease causing skin blistering that do not heal easily; excessive bleeding is likely & can be fatal