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During the digestive period, intestinal phase signals stimulate the release of bile into the small intestine. Fatty acids in the lumen of the duodenum stimulate endocrine cells to release the hormone cholecystokinin (CCK). CCK stimulates contractions in the smooth muscle of the gallbladder. Views.
1. cholecystokinin-a gastrointestinal hormone that stimulates the secretion of pancreatic enzymes and the contraction and emptying of the gall bladder; its release is stimulated by the presence of fatty acids and amino acids in the small intestine.holecystokinin. n. 1. (Biochemistry) a hormone secreted by duodenal cells that stimulates the contraction of the gall bladder and secretion of pancreatic enzymes.