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Flashcards in Small Intestine Function Deck (19):
1

What is the main function of the duodenum?

Gastric acid neutralisation
Digestion
Iron absorption

2

What is the main function of the jejunum?

Nutrient absorption

3

What is the main function of the ileum?

NaCl/water absorption
Chyme dehydration

4

What is the purpose of crypt cells?

Secrete Cl and water

5

When secreted in the small intestine, where does water leave from?

Epithelial cells lining the crypts of Lierberkuhn

6

What is water secretion a consequence of?

Active secretion of chloride into the intestinal lumen

7

How many Na, K, Cl co transporter transport at a given time?

1 Na 1K 2Cl

8

What is the driving force behind the co transporter of Na K and Cl

Sodium potassium ATPase

9

What channel is absent in cystic fibrosis?

CFTR channel

10

What is segmentation?

Contraction and relaxation of short intestinal segments

11

What is the function of segmentation?

Provides thorough mixing of contents with digestive enzymes
Brings chyme into contact with absorbing surface

12

What causes segmentation contractions?

Depolarisation generated by pacemaker cells in longitudinal muscle layer

13

What happens to the basic electrical rhythm from the intestine to the rectum?

BER decreases

14

How will parasympathetic stimulation effect segmentation contractions?

Increases contraction

15

How will sympathetic stimulation effect segmentation contractions?

Decreases contraction

16

What is the migrating motility complex?

Pattern of peristaltic activity travelling down the small intestine

17

What happens to MMC when food enters the stomach?

MMC stops

18

What is the function of MMC?

Moves undigested material into large intestine
Limits bacterial colonisation of small intestine?

19

What is the process of the gastroileal reflex?

Ileocaecal valve opens
Chyme enters large intestine
Colon distends
Ileocaecal sphincter contracts