Physiology: gastric motility and secretion 2

Question 1

what is the control of stomach emptying governed by

Answer 1

gastric factors and duodenal factors

Question 2

what does the strength of the antral wave/pump determine

Answer 2

the escape of chyme through the pyloric sphincter

Question 3

how is the rate of emptying related to the volume of chyme in the stomach

Answer 3

they are proportional

Question 4

what effect does stomach distension(stretched) have on stomach motility

Answer 4

increases motility

Question 5

what consistency of chyme facilitates emptying

Answer 5

thin liquid

Question 6

how does the duodenum delay stomach emptying

Answer 6

neuronal response and hormonal response

Question 7

describe the neuronal response of the duodenum

Answer 7

the enterogastric reflex, decreases antral activity by signals from intrinsic nerve plexuses and the ANS

Question 8

describe the hormonal reponse of the duodenum

Answer 8

release of enterogastrones(e.g. CCK) from duodenum inhibits stomach contraction

Question 9

what stimuli in the duodenum drive the neuronal and hormonal response (4)

Answer 9

fat, acid, hypertonicity, distension