Mainly cholecystokinin is secreted by:: (A) Duodenum, (B) Pancreas, (C) Gallbladder, (D) Ileum
Answer is A. Release of cholecystokinin (CCK) from the duodenum and proximal jejunum is triggered by long-chain fatty acids, ceain essential amino acids (tryptophan, phenylalanine, valine, methionine), and gastric acid itself. CCK evokes an enzyme-rich secretion from acinar cells in the pancreas.