011615 normal structure Flashcards Preview

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Flashcards in 011615 normal structure Deck (14):
1

what modifications in sm intestine increase surface area for absorption

plicae circulares
villi
microvilli

2

epithelial covering of the villi are composed of what cell types

absorptive cells (enterocytes)
goblet cells
enteroendocrine cells

3

crypts of lieberkuhn contain what kind of cells

goblet cells
enteroendocrine cells
stem cells
Paneth cells

4

microvilli in sm intestine are covered with what?

glycocalyx coat (protective roles and involved in digestion of disacchardies and dipeptides into monomers for adsorption through pepetide hydrolases and disaccharidases abundant on apical surface)

5

goblet cells are full of what?

carbohydrates that can be stained

6

role of goblet cells

secrete mucin

7

role of Paneth cells

secrete lysozyme
secrete defensins (neutralize bacterial and viral infections)

8

Peyer's patches are found most numerously where

ileum

9

duodenal submucosa differs from the rest of the GI tract due to the presence of what

Brunner's glands (appear similar to mucous acini)--secrete alkaline mucus that neutralizes the pH of the gastric chyme and protects duodenum

10

the duodenum differs from the jejunum and ileum how

its villi are broader, taller, and more numerous per unit area
Brunner's glands in submucosa

11

how does large intes differ from sm intes?

large intes doesn't have plicae circulairs and villi. it has a relatively smooth surface

its crypts of Lieberkuhn are longer than in the sm intes and contain an abundance of goblet cells

12

what kinds of cells that are present in the sm intestine are actually absent in the large intes?

Paneth cells

13

characteristic feature of appendix

presence of masses of lymphoid tissue in mucosa and submucosa (forms follicles with germinal centers)

14

anus has what histological features

large circumanal glands
stratified squamous epithelium
venous plexi in submucosa (internal hemorrhoidal plexus and external hemor. plexus)