Cholecystokinin (CCK) is a hormone produced by the cells in the duodenum, the first section of the small intestine, that plays a crucial role in digestion and appetite regulation. It is released in response to the presence of fats and proteins in the stomach, stimulating gallbladder contraction to release bile and promoting the secretion of digestive enzymes from the pancreas. CCK also acts on the brain to promote satiety, influencing food intake and metabolism.
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