MEDICAL
RECTUM AND ANUS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The ____ phase of gastric regulation is initiated when acidic chyme enters the duodenum and stimulates the secretion of hormones and local reflexes that inhibit gastric activity.
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cephalic
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voluntary
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gastrointestinal
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laryngo-pharyngeal
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Explanation:
Detailed explanation-1: -The entry of partially digested acidic chyme into the duodenum stimulates specialized mucosal cells to release two important polypeptide hormones into blood; secretin (from duodenal S cells), and cholecystokinin (CCK, from duodenal I cells).
Detailed explanation-2: -Gastric secretion is stimulated by the act of eating (cephalic phase) and the arrival of food in the stomach (gastric phase). Arrival of the food in the intestine also controls gastric secretion (intestinal phase).
Detailed explanation-3: -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.
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