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GI > Small Intestine Function > Flashcards

Small Intestine Function Flashcards

1
Q

What is the main function of the duodenum?

A

Gastric acid neutralisation
Digestion
Iron absorption

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2
Q

What is the main function of the jejunum?

A

Nutrient absorption

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3
Q

What is the main function of the ileum?

A

NaCl/water absorption

Chyme dehydration

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4
Q

What is the purpose of crypt cells?

A

Secrete Cl and water

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5
Q

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

A

Epithelial cells lining the crypts of Lierberkuhn

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6
Q

What is water secretion a consequence of?

A

Active secretion of chloride into the intestinal lumen

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7
Q

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

A

1 Na 1K 2Cl

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8
Q

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

A

Sodium potassium ATPase

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9
Q

What channel is absent in cystic fibrosis?

A

CFTR channel

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10
Q

What is segmentation?

A

Contraction and relaxation of short intestinal segments

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11
Q

What is the function of segmentation?

A

Provides thorough mixing of contents with digestive enzymes

Brings chyme into contact with absorbing surface

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12
Q

What causes segmentation contractions?

A

Depolarisation generated by pacemaker cells in longitudinal muscle layer

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13
Q

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

A

BER decreases

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14
Q

How will parasympathetic stimulation effect segmentation contractions?

A

Increases contraction

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15
Q

How will sympathetic stimulation effect segmentation contractions?

A

Decreases contraction

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16
Q

What is the migrating motility complex?

A

Pattern of peristaltic activity travelling down the small intestine

17
Q

What happens to MMC when food enters the stomach?

A

MMC stops

18
Q

What is the function of MMC?

A

Moves undigested material into large intestine

Limits bacterial colonisation of small intestine?

19
Q

What is the process of the gastroileal reflex?

A

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

GI (27 decks)

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