noun. polypeptide hormone secreted by the mucous lining of the stomach; when peptides and amino acids are present in the small intestine the secretion of gastric acid is stimulated.
1. Noun, singular or mass Decaf coffee has less caffeine, so it is slightly less likely to stimulate gastrin, but it still contains the other chemicals in varying amounts. 2. Noun, plural Hormones gastrin and secretin and nervous impulses from the vagus nerve trigger the release of pepsinogen into the stomach.