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List the hormones secreted by G-I tract.
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Both the stomach and the small intestine of the gastrointestinal tract produce hormones.
Hormones produced by the stomach
The 'G' cells of the stomach secrete the hormone called gastrin.
Hormones produced by the small intestine
- The stimuli for gastrin production include; ingestion of meal, distention (swelling/enlargement) of stomach and products of protein digestion.
- It has 2 main functions; stimulation of gastric acid secretion and stimulation of growth of the gastric mucosa.
Hormones produced by the small intestine
The small intestine secretes 4 hormones; cholecystokinin, secretin, gastric inhibitory peptide (GIP) and Motilin.
Cholecystokinin
Cholecystokinin
- Stimulates pancreatic enzyme and bicarbonate secretion
- Stimulates contraction of the gallbladder
- Also stimulates the growth of the exocrine pancreas
- It inhibits gastric emptying (entry of food into intestine by emptying stomach)
- It stimulates pepsin secretion from stomach and bicarbonate secretion from both pancreas and gallbladder
- Also promotes the growth of exocrine pancreas.
- It inhibits gastric acid secretion.
- Stimulates release of insulin from pancreas
- Inhibits gastric acid secretion
- It is involved in the motility of the gastrointestinal tract.
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| Question Text | List the hormones secreted by G-I tract. |
| Answer Type | Text solution:1 |
| Upvotes | 150 |
