Intro to control of GI tract

Question 1

How much in an empty stomach

Answer 1

50ml

Question 2

How much food can the stomach accomodate

Answer 2

1.5L

Question 3

How does the ANS enable movement of food into the duodenum - first 2 steps

Answer 3

1. Ripples of contraction move the food towards the antrum

2. Pyloric sphincter closes upon arrival of peristaltic wave

Question 4

How does the ANS enable movement of food into the duodenum - last 3 steps

Answer 4

3. Repulsion of chyme; opening of pyloric sphincter
4. Small material squirted into duodenum
5. Repulsion of antral contents backwards towards body allows MIXING.

Question 5

4 types of GI control

Answer 5

Endocrine
Paracrine
Neural
Metabolic - type of food eaten