2.4 lab - epithelia Flashcards Preview

COT 1 (WPH) > 2.4 lab - epithelia > Flashcards

Flashcards in 2.4 lab - epithelia Deck (52)
1

T/F the basal end of an epithelial cell membrane is part of the basal lamina

false - the basal lamina is the connective tissue layer that the basal end of an epithelial cell attaches to -- it is not the same as the basal cell membrane

2

what 3.5 criteria do you use to name an epithelial cell layer?

1) # of layers (simple, stratified, pseudostratified)
2) shape of Top Layer cells (squamous, cuboidal, columnar)
2.5) keratinized vs non-keratinized (if squamous)
3) location of epithelium (epithelium, endothelium, mesothelium)

3

what are 2 special types of epithelia that demand a name other than "epithelium" ?

-endothelium (blood vessels)
-mesothelium (serosa)

4

what are 3 modifications to the usual options for classifying epithelia? (usual = 2 kinds of layers and 3 types of shapes)

-pseudostratified
-transitioinal
-karatinized (or non-keratinized)

5

this kind of epithelium is common in the GI system

simple columnar - absorptive & secretory functions

6

where are you likely to find simple columnar epithelium?

absorptive / secretory locations -- e.g. the GI system

7

this kind of epithelium is found in areas exposed to abrasive forces

stratified squamous epithelia

8

where are you are likely to find stratified squamous keratinized epithelia? name an example

areas exposed to abrasive forces but also wet:
-oral cavity
-vagina

9

where are you are likely to find stratified squamous nonkeratinized epithelia? name an example

skin

10

T/F every free or lumenal surface in the body is lined by an epithelium

true - this is a "golden rule" ... although there are a few exceptions that you are unlikely to encounter in this class

11

blood and lymphatic vessels are always lined with what kind of epithelium

simple squamous ENDOthelium

12

give an example of the function of the luminal surface of endothelial cells

selectively grab leukocytes and transport across epithelium

13

give an example of the function of the basal surface of endothelial cells

initiate clotting if exposed to platelets

14

where are endothelia found

lining blood & lymphatic vessels

15

T/F endothelia are always simple squamous

true - i think

16

what are two names for ...monovacuolar cells containing one large lipid droplet surrounded by a thin layer of cytoplasm with the nucleus is flattened on the periphery

unilocular adipocytes or white fat cells

17

the appearance of a white fat cell

a monovacuolar cell (unilocular adipocyte) containing one large lipid droplet surrounded by a thin layer of cytoplasm with the nucleus flattened on the periphery

18

another name for a white fat cell

unilocular adipocyte

19

another name for a unilocular adipocyte

white fat cell

20

this cell type is polygonal in shape with considerable cytoplasm and lipid droplets scattered throughout with a high concentration of mitochondria. eccentrically located nucleus but not squished on periphery

multilocular adipocytes or brown fat cells

21

the appearance of a brown fat cell

polygonal in shape with considerable cytoplasm and lipid droplets scattered throughout with a high concentration of mitochondria. eccentrically located nucleus but not squished on periphery

22

the appearance of a multilocular adipocyte

polygonal in shape with considerable cytoplasm and lipid droplets scattered throughout with a high concentration of mitochondria. eccentrically located nucleus but not squished on periphery

23

another name for brown fat cell

multilocular adipocyte

24

another name for multilocular adipocyte

brown fat cell

25

how can you tell apart a white fat cell and a similarly sized blood vessel?

blood vessel will likely display:
-multiple endothelial nuclei - fat cell will only have one
-a basal membrane (deeper staining adjacent connective tissue)
-a more round appearance

26

T/F all simple squamous epithelia endothelia

false - mesothelium are also simple squamous

27

where can mesothelia be found

lining inner and outer surfaces of 3 spaces:
-gut (peritoneal cavity / peritoneum)
-heart (pericardial cavity / pericardium)
-lungs (pleural cavity / pleura)

28

what is the mesentery

a connective tissue structure suspending the jejunum and ileum in the peritoneal cavity

29

what is the omentum

a connective tissue structure suspending the duodenum in the peritoneal cavity

30

T/F you will never have a mesothelium adjacent to a lumen

true - mesothelium is always an outer, serosal, layer

31

does mesothelium outline the mesentery or only the circumferential layers of the small intestine?

mesothelium outlines the mesentery too

32

what do tangential sections of squamous cells look like?

pancakes with blueberry nuclei

33

what is the form and function of epithelial cells in the gallbladder

-form: simple cuboidal epithelium
-function: absorb water from the bile

34

on EM, the junctional complex is called...

the junctional complex

35

on LM, the junctional complex is called...

the terminal bar

36

how to tell gallbladder epithelium from intestinal epithelium

-gallbladder has only one type-simple columnar
-intestines may have a different type or multiple types

37

inclusions in simple columnar epithelial cells of the gallbladder may consist of...

absorbed material (water)

38

what do microvilli look like on LM?

a dark, sometimes fuzzy line at apical epithelia (only about 1 micron in length and barely resolvable by LM)

39

transverse section of apical end of simple columnar cells will appear...

more cuboidal and anucleated

40

transverse section of basal end of simple columnar cells will appear...

more cuboidal and nucleated

41

the epithelium of the duodenum consists of...

simple columnar epithelium composed of
-enterocytes (absorptive)
-goblet cells (secretory)

42

"entero" signifies __

intestine
"enterocyte" = intestinal cell

43

the most apical layer of this epithelial type is composed not of intact cells but of densely packed sheets of proteins

stratified squamous keratinized epithelium

44

this type of epithelium should always be further classified as keratinized or nonkeratinized

stratified squamous epithelium

45

the epithelium of the rectum is...

simple columnar epithelium composed primarily of goblet cells

46

between the small intestine and the rectum, which epithelia is primarily enterocytes and which is primarily goblet cells?

small intestine - enterocytes with some goblet
rectum - goblet with some enterocytes

47

the epithelium of the anal canal is...

stratified squamous nonkeratinized SSNK

48

how can you tell SSNK from SSK?

SSNK - nuclei exist in adluminal cells
SSK - no nuclei in adluminal layer

49

the epithelium of the perianal skin is...

stratified squamous keratinized SSK

50

T/F any dry skin in the adult is expected to be keratinized

true

51

what is the name for the point of transition from simple columnar epithelium in the rectum to stratified squamous nonkeratinized epithelium in the anal canal?

the pectinate line

52

what is the pectinate line

the point of transition from simple columnar epithelium in the rectum to stratified squamous nonkeratinized epithelium in the anal canal