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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
If your Doctor is requesting to see the function of your gallbladder, an injection of cholecystokinin will be given and additional images will be performed for thirty minutes. Cholecystokinin is a peptide hormone that is naturally functioning in your body.