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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.
Cholecystokinin causes the gallbladder to contract and deliver bile into the intestine. The force of the contraction propels the bile down the common bile duct and into the small intestine, where it emulsifies (breaks down) fatty molecules.