The 'Hormone Cholecystokinin' (CCK) is secreted by the I cells of the duodenal mucosa in response to the presence of fats and proteins. Its primary actions include: MCQ with Answer and Explanation

Cholecystokinin (CCK) is a peptide hormone released by the I cells of the duodenum when acidic chyme containing fats (lipids) and partially digested proteins enters from the stomach. CCK has two major digestive actions: 1) It stimulates the gall bladder to contract, releasing stored bile into the duodenum to emulsify fats. 2) It stimulates the pancreatic acinar cells to secrete a juice rich in digestive enzymes (lipases, proteases, amylase). It also slows down gastric emptying, allowing more time for digestion in the small intestine.