PHYSIOLOGY
GASTROINTESTINAL PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Where is secretin released?
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In the duodenal mucosa in response to the arrival of gastric acid
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In the esophageal mucosa in response to the arrival of a food bolus
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In the gastric mucosa in response to the arrival of the bolus and the mixture
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None of the above
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Explanation:
Detailed explanation-1: -S cells in the small intestine emit secretin. Gastric acid stimulates secretin release, allowing movement into the duodenal lumen.
Detailed explanation-2: -Secretin is secreted from S cells in the duodenum in response to H+ and fatty acids in the lumen. Specifically, a pH less than 4.5 signals arrival of gastric contents, which initiates the release of secretin.
Detailed explanation-3: -The correct answer is True. Secretin is a hormone secreted by the enteroendocrine cells (S cells) of the duodenum in response to the arrival of acidic chyme from the stomach.
There is 1 question to complete.