Question

The contraction of gall bladder is due to

• A. Gastrin
• B. Secretin
• C. Cholecystokinin
• D. Enterogastrone

Answer 1

The correct option is C Cholecystokinin

The enteroendocrine cells secrete gastrin, which in turn promotes stomach churning and induces more release of gastric juices.

Secretin and cholecystokinin are secreted by endocrine cells of the duodenal wall in response to presence of hydrochloric acid in chyme and that of fatty food respectively.

Secretin induces the release of pancreatic juice from pancreas, while cholecystokinin induces contraction of gall bladder to release stored bile. This makes option B incorrect and option C correct.

Option D is incorrect, as enterogastrone refers to any hormone secreted by duodenum in response to presence of fatty food.