Answer :
The release of cholecystokinin by duodenal enteroendocrine cells in response to protein- and fat-rich chyme causes increased production of HCO₃- by pancreatic duct cells, increased secretion of pancreatic juice by acinar cells, suppression of gastric emptying, and gall bladder contraction. Thus, options a, b, d, and f are correct.
Cholecystokinin functions to stimulate the release of pancreatic enzymes, including bicarbonate ions, to aid in the digestion and absorption of fats and proteins in the small intestine. This results in increased production of HCO₃- by pancreatic duct cells and increased secretion of pancreatic juice by acinar cells. Additionally, cholecystokinin promotes gall bladder contraction, which leads to increased bile secretion by the liver. Furthermore, it suppresses gastric emptying, allowing for proper digestion and absorption of nutrients in the small intestine. Therefore, options a, b, d, and f are the correct physiological responses to cholecystokinin release.