Hepatic and pancreatic enzyme discharges are additionally triggered by an intestinal mucosal peptide hormone designated as___________?
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Answer: C. Secretin
Explanation
Secretin acts as a key intestinal peptide hormone that stimulates the pancreas and liver to release digestive fluids. Arrival of acidic chyme in the duodenum triggers the mucosal release of secretin into the bloodstream. The hormone promotes the secretion of bicarbonate-rich fluid to neutralize stomach acid in the small intestine. Secretin was historically the very first hormone discovered by physiologists studying gastrointestinal regulatory processes. Endocrine cells located in the mucosal lining of the upper small intestine synthesize and release this peptide. Pancreatic enzymes and liver bile require an alkaline environment maintained by secretin action to function properly.
Creatin is a nitrogenous compound involved in muscle energy metabolism rather than a gastrointestinal hormone. Gastrin primarily stimulates gastric acid secretion in the stomach rather than triggering pancreatic enzyme discharges. Pepsin functions as a protein-digesting enzyme in the stomach rather than serving as an intestinal peptide hormone.
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