Labels:text | screenshot | black and white | black | document | monochrome OCR: ptide Secretin is a twenty-seven amino-acid p bred produced by S cells that are sparsely scatt acosa, Its throughout the duodenal and jejunal m te the main physiological function is to stimul he secretion of watery alkaline juices from members pancreatic ducts. In common with other s secretion of this family of peptides, secretin inhibi ase, of gastric acid and stimulates insulin rel macologicalalthough these effects occur only at phar retion is a doses. The main stimulus to secretin sec arely, but duodenal pH of less than 4. This occurs et the the secretion of alkaline juices may prote duodenum the fasted state,