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Questions and Answers
Which hormone was the first gastrointestinal hormone to be discovered?
Which hormone was the first gastrointestinal hormone to be discovered?
- Gastric inhibitory peptide
- Secretin (correct)
- Motilin
- Gastrin
What mainly stimulates the release of gastric inhibitory peptide?
What mainly stimulates the release of gastric inhibitory peptide?
- Carbohydrates
- Proteins
- Bile acids
- Fatty acids and amino acids (correct)
Which hormone is secreted by the 'S' cells in the duodenum?
Which hormone is secreted by the 'S' cells in the duodenum?
- Cholecystokinin
- Secretin (correct)
- Gastrin
- Motilin
What is the primary function of motilin?
What is the primary function of motilin?
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Which hormone is released in response to acidic gastric juice emptying into the duodenum?
Which hormone is released in response to acidic gastric juice emptying into the duodenum?
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How often are inter digestive myoelectric complexes stimulated by motilin?
How often are inter digestive myoelectric complexes stimulated by motilin?
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Study Notes
Gastrointestinal Hormones
Secretin
- Discovered as the first gastrointestinal hormone
- Produced by "S" cells in the duodenum's mucosa
- Released in response to acidic gastric juice entering the duodenum
- Has a mild effect on the motility of the GI tract
- Stimulates pancreatic secretion of bicarbonate to neutralize acid in the small intestine
Gastric Inhibitory Peptide (GIP)
- Secreted by the upper small intestine's mucosa
- Mainly responds to fatty acids and amino acids
- Also responds to carbohydrates, but to a lesser extent
- Decreases motor activity in the stomach
- Slows the emptying of gastric contents into the duodenum to prevent overloading the small intestine with food
Motilin
- Released by the upper duodenum during fasting
- Only function is to increase GI motility
- Released cyclically, stimulating waves of motility
- Involved in inter digestive myoelectric complexes that move through the stomach and small intestine every 90 minutes
- Inhibited after ingestion, but the mechanisms are unknown
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Description
Learn about the functions and characteristics of gastrointestinal hormones, including Secretin and Gastric Inhibitory Peptide (GIP).
