The Secretin reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Secretin

Secretin is a hormone produced in the S cells of the duodenum to signal the secretion of bicarbonate from bicarbonate producing organs(liver, pancreas, Brunner’s glands) when the pH drops below a set value. This helps neutralize the gastric acid entering the duodenum from the stomach.

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