function of the cells in GI tract

Question 1

what is the source of gastrin

Answer 1

G cells in the antrum of the stomach

Question 2

what stimulates release of G cells

Answer 2

distension of stomach, somatostatin

Question 3

what are the actions of G cells

Answer 3

increases HCL, pepsinogen and IF secretion, increases gastric motility, trophic effect on gastric mucosa

Question 4

source of CCK

Answer 4

I cells in upper small intestine

Question 5

what stimulates release of CCK

Answer 5

partially digested proteins and triglycerides

Question 6

what are the actions of CCK

Answer 6

increased secretion of enzyme rich fluid from pancreas
contraction of gallbladder
decreases gastric emptying
induces satiety

Question 7

source of secretin

Answer 7

s cells in upper small intestine

Question 8

what stimulates release of secretin

Answer 8

acid in small intestine

Question 9

function of secretin

Answer 9

increases secretion of bicarbonate rich fluid from pancreas and hepatic duct cells
decreases gastric secretion

Question 10

source of somatostatin

Answer 10

D cells in the pancreas and stomach

Question 11

what stimulates somatostatin

Answer 11

fat, bile and salts in the small intestine

Question 12

function of somatostatin

Answer 12

decreases acid and pepsin secretion
decreases gastric secretion
decreases pancreatic emzyme secretion
stimulates gastric mucous production