Tissue Epithelial (wk3 ch5.2)

Question 1

Epithelial tissue consists of

Answer 1

a sheet of closely adhering cells one or more cells thick with the upper surface usually exposed to the environment or to an internal space in the body

Question 2

what are the 6 functions of epithelia tissue

Answer 2

-protection
-secretion
-excretion
absorption
-filtration
-sensation

Question 3

what does avascular mean?

Answer 3

without blood vessels

Question 4

Describe what epithelia cells look like?

Answer 4

avascular, there is no room for them between the cells

Question 5

describe locations of typical epithelial tissue

Answer 5

vessel-rich layer of connective tissue (to furnishes with nutrients and waste removal)

Question 6

what is a then layer of glycoproteins, collagen, and glycosaminoglycans beneath the deepest of an epithelium serving to bind the epithelium to the underlying tissue

Answer 6

basement membrane

Question 7

basal surface is

Answer 7

the lowest surface of an epithelial cell attached to either a basement membrane or an underlying epithelial cell.

Question 8

apical surface is

Answer 8

the uppermost surface of an epithelial cell, usually exposed to the lumen of an organ

Question 9

located between basal and apical surface as the “sidewall” of a cell

Answer 9

lateral surface

Question 10

two broad categories of epithelia

Answer 10

• simple (every cell is anchored to the basement membrane)

- stratified (some cells rest on top of other cells and do not contact basement membrane)

Question 11

three cell shapes

Answer 11

• squamous
• cuboidal
• columnar

Question 12

pseudostratifed columnar is

Answer 12

type of simple that gives a false appearance of multiple cell layers sometimes looks like stratified

Question 13

has only one layer of cells; four types

Answer 13

simple epithelium

Question 14

where are goblet cells often found and what are they?

Answer 14

• in simple columnar and pseudostratified columnar

- wine glassed shaped and produce protective mucous coatings over the mucous membranes

Question 15

range from 2 to 20 or more layers of cells with some cells resting directly on others

Answer 15

stratified epithelia

Question 16

fourth type of stratified epithelia found in urinary tract

Answer 16

urothelium

Question 17

most common epithelium?

Answer 17

Stratified squamous epithelium (deepest layer of cells are cuboidal to columnar and include mitotically active stem cells)

Question 18

exfoliate cytology is?

Answer 18

study of exfoliated cells

Question 19

what does keratinized (cornified) mean?

Answer 19

covered with a layer of dead compressed cells called Keratinocytes packed with durable protein keratin and coated in water repellent gycolipid

Question 20

what is nonkeratinized mean?

Answer 20

lacks the surface layer of dead cells. Is abrasion-resistant, but moist and slippery

Question 21

what are the domed surface cells of urothelium called and why are they important

Answer 21

• umbrella cells
• the outer phospholipid layer of the plasma membrane is thicker than usual and has dense patches called lipid rafts with embedded proteins called uroplakins