Epithelial Tissue Flashcards Preview

Histology Exam 1 > Epithelial Tissue > Flashcards

Flashcards in Epithelial Tissue Deck (46):
1

a layer of cells that cover a surface

epithelia

2

Functions of epithelia

1. covering and lining a surface (skin) - barrier
2. regulation of materials and sensory information (absorption, secretion, sensation, lubrication)
3. contractility ( sweat and mammary glands)
4. protection from external environment

3

epithelia cell that is flat, very thin in cross section

squamous

4

epithelia that appear square in cross section

cuboidal

5

epithelia that appear rectangular, tall, long in cross section

columnar

6

in reality, the cells are really ______ in 3D

polyhedral

7

epithelia consisting of one layer of cells

simple

8

location of simple squamous

air sac of lungs, blood vessels

9

location of simple cuboidal

kidney tubules

10

location of simple columnar

small intestine- jejunum

11

epithelia consisting of more than one layer of cells

stratified

12

location of keratinized stratified squamous epithelium

skin

13

location of non keratinized stratified squamous epithelium

mouth, vagina

14

location of stratified columnar epithelium

rare- male urethra

15

location of stratified cuboidal epithelium

rare- sweat glands

16

location of transitional epithelium

bladder

17

location of pseudo stratified epithelium

respiratory tract, trachea

18

found wherever an epithelium contacts connective tissue, consists of granular layer of thin fibrils that is composed of collagen, glycoprotein called proteoglycans

basal lamina

19

basal lamina consists of three parts

1. lamina densa
2. lamina rara
3. lamina reticularis

20

a fibrous , darkly staining layer into which fibers from hemidesmosomes, as well as adjacent extracellular matrix, insert
- part of basal lamina

lamina densa

21

the lamina densa is composed of type ___ collagen and _______

type IV
proteoglycans

22

a clear non staining layer ( may be on one or both sides of the lamina densa )
- part of basal lamina
-contains glycoprotein and laminin

lamina rara

23

part of the basal lamina that is between the lamina dense and lamina rara and underlying tissue. Meshwork of reticular fibers

lamina reticularis

24

like sticks to like

cohesion

25

epithelia cells cohere to each other . in part due to binding action of surface molecules such as _________

glycoproteins

26

______ is important in cohesion, and cells tend to disassociate with out it

calcium

27

disk shaped structures on cells that foam adjacent electron dense areas seen in ultrastructural preps.

desmosomes (macula adherens)

28

_____ ______ restricts direct passage of solids and fluids from outside of epithelia into regions between the epithelial cells

zonula occludens

29

acts as anchoring point for terminal web of apical actin filaments found in tall columnar epithelial cells

zonula adherens

30

autoimmune disease caused by antibodies damaging the desmoglein proteins in the maculae adherens (desmosomes)

pemphigus folaceus

31

glands where secretion released into surrounding capillaries, no ducts.

endocrine

32

glands where secretion usually released through dicts. secretory cells form a true epithelium

exocrine

33

the change in the type of adult cells in a tissue to a form abnormal for that tissue

metaplasia

34

smoking causes metaplasia where columnar turns into

squamous

35

metaplasia where transitional turns into ____ due to a bladder stone

squamous

36

type of exocrine secretion
product released by exocytosis from cell cytoplasm

merocrine

37

type of exocrine secretion
whole cell is shed as secretion, sebaceous glands of skin

holocrine

38

type of exocrine secretion
apical portion of cell is shed as secretion, like mammary gland, goblet cells

apocrine

39

exocrine gland with no duct , individual secretory cells embedded in an epithelium that lines a structure (goblet cells )

unicellular gland

40

gland that has a single, non branched duct
- the secretary components can be branched

simple gland

41

type of exocrine gland where the duct is branched, ramified

compound

42

type of exocrine gland where the secretory parts consist of tubes

tubular glands

43

type of exocrine gland where the secretary portion consists of a coiled tube

coiled gland

44

type of exocrine gland where the secretory part consist of bag like structures

acinar or alveolar gland

45

type of exocrine gland where secretory parts consist of a combination of bags and tubes

tubuloacinar gland or
tubuloalveolar gland

46

T/F: there are blood vessels in epithelium

false