Which of the following is classified as a gastrointestinal hormone_______________?
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Answer: C. Cholecystokinin
Explanation
Cholecystokinin is a peptide hormone secreted by endocrine cells in the proximal small intestine. It stimulates pancreatic enzyme secretion and gallbladder contraction to aid in dietary lipid digestion. This gastrointestinal hormone release is triggered by the presence of fats and amino acids in food. Gastrointestinal hormones coordinate digestive processes across the stomach and intestinal tracts. Endocrine cells scattered throughout the mucosal lining release these signaling peptides into local blood vessels. Nutrient arrival in the duodenum prompts rapid hormone secretion to optimize digestive enzyme activity.
Cholecystokinin also acts on brain satiety centers to help signal fullness during meals. Clinical studies explore these gut hormones to develop new treatments for obesity and metabolic disorders. Gastroenterologists analyze hormone levels when evaluating patients with chronic digestive motility issues. Pepsin is a digestive enzyme secreted by gastric chief cells rather than an endocrine hormone. Ptyalin is an old term for salivary alpha amylase which digests starches in the oral cavity. Trypsin is a proteolytic enzyme produced in the pancreas to break down dietary proteins in the gut.
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