The hormone primarily responsible for the contraction of the gallbladder and the release of bile into the duodenum is cholecystokinin.
Cholecystokinin also called pancreozymins is produced in the duodenum which is a part of the small intestine by the cells known as enteroendocrine cells and its secretion is stimulated by the introduction of fatty acids and amino acids. This hormone is involved in the process of digestion.
Cholecystokinin causes the contraction of the gallbladder which then releases bile and enzymes into the small intestine. Bile salts and other enzymes are involved in the breakdown of fats and proteins so that they can be absorbed in the small intestine. During the digestion process, this hormone also slows down gastric emptying and controls bowel motility.
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