The duodenum secretes a hormone which has following effects except:

A. Cause copious pancreatic juice rich in bicarbonate and poor in enzymes

B. Increase gastric motility

C. Causes gall bladder to contract and sphincter of Oddi to relax

D. Leads to meagre flow of pancreatic juice rich in enzymes

Correct Answer: Increase gastric motility

Description: Secretin was the first gastrointestinal hormone discovered and is secreted by the “S” cells in the mucosa of the duodenum in response to acidic gastric juice emptying into the duodenum from the pylorus of the stomach. Secretin has a mild effect on motility of the gastrointestinal tract and acts to promote pancreatic secretion of bicarbonate, which in turn helps to neutralize the acid in the small intestine.

Category: Physiology

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