Question
What are the gastrointestinal hormones? Explain the function of each.
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Answer
- There are scattered endocrine cells in different parts of alimentary canal.
- These cells secrete four peptide hormones which are gastrin, secretin, cholecystokinin (CCK) and gastric inhibitory peptide (GIP).
- Gastrin stimulates gastric glands for the secretion of hydrochloric acid and pepsinogen.
- The secretin acts on exocrine pancreas and stimulates secretion of water and bicarbonate ions to form pancreatic juice.
- CCK acts on pancreas and gall bladder and stimulates the secretion of pancreatic enzymes and bile juice respectively.
- GIP inhibit gastric secretion and motility.
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