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Cholecystokinin is a hormone which is secreted by the duodenal wall. It causes the release of bile by the contraction of the gall bladder & increases the enzyme release process of pancreatic cells. The pancreatic juice enterokinase is an ‘activator enzyme’ which is present in the intestinal juice (succus entericus) and converts the inactive proenzyme trypsinogen to active trypsin enzyme. Secretin is also a hormone and causes the release of sodium bicarbonate in the pancreatic juice.

1. Cholecystokinin is secreted by the pancreas.
2. Cholecystokinin is secreted by the liver.
3. Cholecystokinin is secreted by the duodenal wall.
4. Cholecystokinin is secreted by the stomach.

Correct answer: Cholecystokinin is secreted by the duodenal wall.

Solution

Cholecystokinin (CCK) is produced by cells in the duodenal wall and helps stimulate bile release and pancreatic enzyme secretion. That makes the duodenal wall the correct source, not the pancreas, liver, or stomach.

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