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From Wikipedia, the free encyclopedia. Gastrin is a peptide hormone that stimulates secretion of gastric acid (HCl) by the parietal cells of the stomach and aids in gastric motility. It is released by G cells in the pyloric antrum of the stomach, duodenum, and the pancreas.
Gastric Phase. The gastric phase of digestion begins when food enters the stomach, causing the stomach to extend. The stomach then continues to release the digestive chemicals hydrochloric acid and pepsin, first stimulated in the cephalic phase.tomach chemical secretion ceases once the intestinal phase of digestion begins. This action is initiated by the stretching of the duodenum and the secretion of the hormone enterogastrone.