Secretin

is secreted by the pancreas

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is released by the pyloric mucosa

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contracts the gallbladder wall

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increases the pancreatic secretion of water and bicarbonates

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Solution

The correct option is D increases the pancreatic secretion of water and bicarbonates
Secretin, secreted by the epithelium of the duodenum, stimulates the release of bicarbonates into the pancreatic juice. In the liver, it stimulates the secretion of bile. In the stomach, it inhibits gastric secretion and motility.
Pyloric mucosa refers to the mucosal layer of the pyloric part of the stomach. It does not secrete or release secretin.
Secretin does not contract the gallbladder wall.

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