Surface Epithelium

Question 1

does epithelium have blood vessels?

Answer 1

no its avascular

Question 2

what separates epithelium tissue and vascular tissue?

Answer 2

the basement membrane

Question 3

what type of epithelium lines the inner body cavity?

Answer 3

mesothelium

Question 4

what lines the inner surfaces of the blood and lymph vessels

Answer 4

endothelium

Question 5

type of epithelium lining blood vessels, lymph vessels and heart

Answer 5

simple squamous

Question 6

type of epithelium in the excretory ducts of glands, thyroid, kidney tubules, ovaries

Answer 6

simple cuboidal

Question 7

type of epithelium that lines the GIT

Answer 7

simple columnar

Question 8

what are epithelial cells called?

Answer 8

enterocytes

Question 9

what function does the epithelium in the lumen of the intestines?

Answer 9

absorption of the components of the digested food

Question 10

what epithelial cells produce mucus?

Answer 10

goblet cells

Question 11

what is the brush border in epithelial cells

Answer 11

composed of microvilli which increase surface area for absorption

Question 12

what is the function of basal cells?

Answer 12

mitotically active- replaced damaged epithelial cells

Question 13

where is stratified squamous epithelium found?

Answer 13

vagina or tongue

Question 14

where is stratified columnar epithelium found?

Answer 14

parotid gland (salivary) or mammary gland

Question 15

what are the extensions into the oesophagus?

Answer 15

papillae

Question 16

where is transitional epithelium found?

Answer 16

urinary passages

Question 17

what is the basement membrane composed of?

Answer 17

two layers:

1. basal lamina
2. reticular lamina

Question 18

what is the basal lamina composed of?

Answer 18

glycoproteins: laminin and collagen, embedded in an amorphous matrix

Question 19

what is the reticular lamina composed of?

Answer 19

reticular fibers embedded in ground substance

Question 20

what acts as a selectively permeable barrier between the epithelium and connective tissue?

Answer 20

basal lamina

Question 21

which is shorter: microvilli or stereocilia?

Answer 21

microvilli

Question 22

what do microvilli contain?

Answer 22

actin filaments

Question 23

does epithelium contain connective tissue?

Answer 23

no

Question 24

what specializations support the function of epithelia?

Answer 24

desmosomes and intermediate junctions

Question 25

what are desmosomes?

Answer 25

specializations of the lateral cell membranes that mediate cell adhesion

Question 26

what are glands?

Answer 26

cells thats function is secretion

Question 27

what are exocrine glands?

Answer 27

release the secretory product onto surface of the body

Question 28

what are endocrine glands?

Answer 28

release secretory product, usually hormones, into the extracellular spaces between cells and then transfers to bloodstream

Question 29

which type of glands maintains contact with the surface epithelium?

Answer 29

exocrine

Question 30

an example of a unicellular gland

Answer 30

goblet cells

Question 31

an example of a multicellular gland

Answer 31

secretory epithelial sheath- surface epithelium consisting entirely of secretory cells eg stomach

Question 32

different forms of glands

Answer 32

tubular, acinar, alveolar

Question 33

what type of gland is the pancreas

Answer 33

tubulo-acinar gland

Question 34

what are the 3 secretory mechanisms?

Answer 34

apocrine, merocrine and holocrine

Question 35

mechanism of apocrine secretion

Answer 35

part of the apical cytoplasm of the cells is lost together with the secretory product

Question 36

mechanism of merocrine secretion

Answer 36

Vesicles open onto the surface of the cell, and the secretory product is discharged from the cell

Question 37

mechanism of holocrine secretion

Answer 37

breakdown and discharge of the entire secretory cell ie sebaceous glands