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Flashcards in Digestive system Deck (26):
1

What is digestion?

breaking down larger food molecules into smaller ones

2

What is absorption?

passage of these molecules into blood and lymph

3

Layers of the alimentary canal?

1. mucosa 2. submucosa 3. muscularis 4. serosa

4

where is MALT located?

lamina propria of the mucosa layer

5

What is mastication?

chewing

6

saliva does?

moistens food, is a solvent and a buffer. Is 99.5% water and amylase

7

What is deglutition?

swallowing

8

What are the ranges for the stomach?

50 ml to 4 L

9

Chief cells?

pepsinogen

10

Gastric juice+food=

chyme

11

Chemical digestion

H coming together with Cl. activate pepsinogen to pepsin, which digests proteins.

12

Gastric absorption is impermeable except to?

water, ions, aspirin, alcohol

13

What does the liver emulsify?

fat

14

Kupffers cells?

fixed macrophages

15

What is the pH of Bile?

7.6-8.6

16

what are micelles?

fatty acids+bile salts+cholesterol in a ball

17

Small intestine is divided how?

1. duodenum 2. jejunum 3. Ilieum

18

Plicae circulares?

increase surface area in the small intestine

19

MALT

mucosa associated lymphoid tissue

20

Peyers patches?

lymphoid tissue in the lamina propria

21

what percentage of absorption occurs in the small intestine?

90%

22

Carbs are digested how?

facilitated diffusion or active transport

23

lipids are digested how?

simple diffusion

24

vitamins are digested how?

simple diffusion

25

proteins are digested how?

active transport

26

water is absorbed how?

osmosis