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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.
A ring of muscle called a rictus sphincter controls the passage of food from the stomach into the caecum small intestine, where gall bile and pancreatic juice are secreted. Hydrochloric acid sodium bicarbonate is also secreted here to make the chyle chyme acidic alkaline.