Answer :
Cholecystokinin (CCK) causes the pancreas to secrete enzyme-rich pancreatic juice, stimulates gall bladder contraction, relaxes the hepatopancreatic sphincter, and suppresses gastric emptying. Increased production of bicarbonate by the pancreas is stimulated by secretin, not CCK. Therefore, the correct answers are 2. Increased secretion of pancreatic juice by acinar cells, 3. Increased bile secretion by liver, 4. Suppression of gastric emptying, 5. Relaxation of hepatopancreatic sphincter and 6. Gall bladder contraction.
The effects caused by the release of cholecystokinin (CCK) by duodenal enteroendocrine cells in response to protein- and fat-rich chyme include:
- Increase in the secretion of enzyme-rich pancreatic juice by acinar cells.
- Stimulation of gall bladder contraction to facilitate the release of bile.
- Relaxation of the hepatopancreatic sphincter to allow bile and pancreatic juice into the duodenum.
- Suppression of gastric emptying to regulate the flow of chyme.
While CCK influences the secretion of pancreatic digestive enzymes, it is the hormone secretin that stimulates the increased production of bicarbonate (HCO3-) by pancreatic duct cells, rather than CCK. Therefore, the correct responses to the student's question would include options 2, 3, 4, 5, and 6.