Question

what stimulates the secretion of cholecystokinin from the intestinal wall?
multiple choice
protein in the stomach
protein and fat in the small intestine
fat in the stomach
carbohydrates in the small intestine

Explanation:

Cholecystokinin (CCK) is a hormone. It is secreted by the I - cells in the duodenum (part of the small intestine). The presence of partially digested proteins and fats (especially fatty acids and monoglycerides) in the chyme (partially digested food entering the small intestine from the stomach) stimulates the release of CCK. Stomach contents (whether protein or fat in the stomach) do not directly stimulate CCK secretion as CCK - secreting cells are in the small intestine. Carbohydrates in the small intestine do not stimulate CCK secretion. CCK has functions such as stimulating gallbladder contraction, pancreatic enzyme secretion, and reducing gastric emptying.

Answer:

Protein and fat in the small intestine