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Unformatted text preview: o Pepsin starts protein digestion. o Intrinsic factor aids in vitamin B 12 absorption. o Gastrin helps regulate stomach secretions and movements. Regulation of stomach secretions. o During the cephalic phase, the stomach secretions are initiated by the sight, smell, taste, or thought of food. Gastrin stimulates stomach secretions. o During the gastric phase, partially digested proteins or distention of the stomach also promotes secretion. o During the intestinal phase, acidic chyme in the duodenum stimulates neuronal reflexes and the secretion of hormones that induce and then inhibit gastric secretions. Gastrin stimulates stomach secretion. Secretin, gastric inhibitory polypeptide, and cholecystokinin inhibit gastric secretion. Movement in the stomach. o Mixing waves mix the stomach contents with the stomach secretions to form chyme. o Peristaltic waves move the chyme into the duodenum....
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- Fall '10