Cholecystokinin is secreted by

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(B) Cholecystokinin $(CCK)$ is a peptide hormone primarily secreted by the $I$-cells in the mucosal epithelium of the small intestine,specifically in

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Small intestine

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(B) Cholecystokinin $(CCK)$ is a peptide hormone primarily secreted by the $I$-cells in the mucosal epithelium of the small intestine,specifically in the duodenum and jejunum. Its primary functions include stimulating the release of digestive enzymes from the pancreas and the contraction of the gallbladder to release bile into the small intestine,which aids in the digestion of fats and proteins.

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