epithelial tissue

Question 1

4 types of tissue

Answer 1

1. epithelial tissue
2. connective tissue
3. muscle tissue
4. nervous tissue

Question 2

what are the three origins of epithelial tissue?

Answer 2

1. endodermal
2. mesodermal
3. ectodermal

Question 3

endodermal

Answer 3

gut, respiratory track, urinary track

Question 4

mesodermal

Answer 4

kidney, reproductive tract, muscle and blood

Question 5

ectoderm

Answer 5

epidermis/outer layer of skin, nervous system, mouth + anus

Question 6

4 functional properties of epithelial tissue

Answer 6

1. coverings, linings + protective surfaces
2. transport (absorption/secretion)
3. contractile
4. sensory

Question 7

is epithelia vascularized?

Answer 7

no

Question 8

gap junctions are important for what?

Answer 8

communication–> signaling molecules can travel between cells

Question 9

syncytium

Answer 9

a single cell or cytoplasmic mass containing several nuclei, formed by fusion of cells or by cell division of nuclei

Question 10

purpose of microvilli?

Answer 10

increase surface area
absorption epithelia
presence of enzyme sieve

Question 11

purpose of stereocilia?

Answer 11

increase surface area
absorption
can be branched

Question 12

purpose of cilia?

Answer 12

movement–> flow + moving of mucus

Question 13

simple squamous epithelium

Answer 13

single layer of cells
squamous= flat
connective tissue
nucleus bulges

Question 14

simple cuboidal epithelium

Answer 14

cuboidal= single layer, square or a cube
nuclei spaced
connective tissue beneath the epithelium

Question 15

simple columnar epithelium

Answer 15

single layer
cells sitting on a basal membrane
surface orientation quiet variable

Question 16

stratefied epithelium

Answer 16

2 collagens, not vascularized
don’t have their own blood supply

Question 17

stratum corneum

Answer 17

dead layer of squamous cells

Question 18

what is the order from the top to bottom of strata of epidermis in skin?

Answer 18

stratum corneum
stratum lucidum
granulosum
stratum spinosum
stratum basale
dermis

Question 19

pseudostratified epithelium

Answer 19

appears to be stratefied but is not
all the cells sit on the basal membrane
ciliated border and terminal bar at top

Question 20

types of epithelial cells (6)

Answer 20

squamous
cuboidal
columnar
simple
stratified
pseudostratified