Answer :
The GI hormone that promotes a pancreatic juice rich in bicarbonate ions is (b) secretin. Secretin is produced by the S cells in the duodenum in response to the presence of acidic chyme.
It stimulates the pancreas to secrete pancreatic juice that is rich in bicarbonate ions. Bicarbonate ions are important because they help neutralize the acidity of the chyme, which helps protect the lining of the small intestine from damage.
In addition to stimulating the pancreas, secretin also inhibits gastric acid secretion and motility in the stomach, which slows down the emptying of the stomach contents into the duodenum. This helps ensure that the acidic chyme is properly neutralized before it enters the small intestine.
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