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Cholecystokinin is secreted by I-cells in the small intestine and induces contraction of the gall bladder, relaxes the sphincter of Oddi, reduces of gastric acid secretion, increases bile acid production in the liver, delays gastric emptying, and induces digestive enzyme production in the pancreas.
The gallbladder acts as a storage vessel for bile produced by the liver. Bile is produced by hepatocytes cells in the liver and passes through the bile ducts to the cystic duct. From the cystic duct, bile is pushed into the gallbladder by peristalsis (muscle contractions that occur in orderly waves). Bile is then slowly concentrated by absorption of water through the walls of the gallbladder.