Which of the following is/are functions of secretin?
I. It releases bicarbonates into the pancreatic juice
II. Promotes the secretion of bile
III. It inhibits gastric secretion and motility

Only statement I

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Only statement II

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Only satement III

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All of them

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Solution

The correct option is D All of them
Secretin is a hormone that is produced by the cells in the mucosal layer of the duodenum of the small intestine.
It helps the pancreas to stimulate and release bicarbonates into the pancreatic juice. It helps the liver by promoting the secretion of bile. It also inhibits the production of gastric juice and inhibits gastric motility.

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Similar questions

Column - I	Column - II
(a) Secretin	(i) Stimulates gastric gland to release gastric juice
(b)Cholecystokinin	(ii) Stimulates gall bladder to release bile juice
(c) Gastrin	(iii) With coeffect of pancreozymin stimulates secretion pf pancreatic juice and intestinal juice
(d) Enterogastrone	(iv) Inhibits gastric juice secretion and stops stomach churning

Hormones	Source of Secretion	Action
(1) CCK	Duodenum	Contraction of gall bladder, inhibits gastric emptying
(2) Gastrin	Pyloric stomach	secretion of $H C l$
(3) Secretein	Duodenum	Decrease pancreatic $H C O_{3}^{-}$ and $H_{2} O$
(4) GIP (Gastricinhibitory peptide)	Duodenum	Inhibition of gastric secretion and motility

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