Hormones and Hormone-like Products That Act in Digestion

Question 1

Gastrin

Answer 1

Source
• Stomach
Stimulus for secretion
• Food in stomach, particularly partially digested proteins; ACh released by nerve fibers
Action
• Stimulates release of gastric juice
• Stimulates stomach emptying

Question 2

Intestinal gastrin

Answer 2

Source
• Duodenum
Stimulus for secretion
• Food in stomach
Action
• Stimulates gastric secretion and emptying

Question 3

Histamine

Answer 3

Source
• Stomach
Stimulus for secretion
• Food in stomach
Action
• Activates parietal cells to secrete hydrochloric acid

Question 4

Somatostatin

Answer 4

Source
• Stomach and duodenum
Stimulus for secretion
• Food in stomach stimulated by sympathetic nerve fibers
Action
• Inhibits secretion of gastric juice and pancreatic juice
• Inhibits emptying of stomach and gallbladder

Question 5

Secretin

Answer 5

Source
• Duodenum
Stimulus for secretion
• Acidic chyme and partially digested foods in duodenum
Action
• Increases output of pancreatic juice rich in bicarbonate ions
• Increases bile output by liver
• Inhibits gastric mobility and gastric gland secretion

Question 6

Cholecystokinin (CCK)

Answer 6

Source
• Duodenum
Stimulus for secretion
• Fatty chyme and partially digested proteins in duodenum
Action
• Increases output of enzyme-rich pancreatic juice
• Stimulates gallbladder to expel stored bile
• Relaxes sphincter of duodenal papilla to allow bile and pancreatic juice to enter the duodenum

Question 7

Gastric inhibitory peptide (GIP)

Answer 7

Source
• Duodenum
Stimulus for secretion
• Food in duodenum
Action
• Inhibits secretion of gastric juice
• Stimulates insulin release