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Cholecystokinin definition, a hormone secreted by the upper portion of the intestine that stimulates contraction of the gallbladder and increases secretion of pancreatic juice. See more. Dictionary.com
Cholecystokinin (CCK) is the major hormone responsible for gallbladder contraction and pancreatic enzyme secretion.CCK, like other gastrointestinal hormones, is produced in discrete endocrine cells that line the mucosa of the small intestine [ 1 ].holecystokinin (CCK) is the major hormone responsible for gallbladder contraction and pancreatic enzyme secretion.