Gastric Secretion

Question 1

What proportion of gastric juice is from the cephalic phase?

Answer 1

1/3

Question 2

What proportion of gastric juice is from the gastric phase?

Answer 2

2/3

Question 3

What stimulates the cephalic phase of gastric secretion?

Answer 3

Sight
Though
Smell
Taste
(Before food enters the stomach)

Question 4

What inhibits the cephalic phase of secretion?

Answer 4

Anything that activates SNS
Stress
Upset

Question 5

How does something such as smell of food stimulate the cephalic phase of secretion?

Answer 5

Stimulate cerebral cortex neurones
Sends info to hypothalamus
Sends info to dorsal nucleus vagus
Sends info to all parts of stomach by the vasgus nerve
Mainly to parietal and chief cells to make hcl and pepsinogen

Question 6

How does stress inhibit the cephalic phase of gastric secretion?

Answer 6

Preganglipnic fibres stimulate the sphlanchnic nerve
Which tires to inhibit vagus nerve stimulation
Decreased hcl and pepsinogen secretion

Question 7

What stimulates the gastric phase of secretion?

Answer 7

Distension which is sensed by stretch receptors in the submucoaa and the muscular is externa