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This is a list of hormones corresponding to what place in the body (not a question, just a review)
Gastrin: responds to food in the stomach, secreted from stomach wall, stimulates stomach glands, response is HCL secreted into the stomach
Secretin: responds to acidic chyme in the S.I., secreted from duodenal wall, stimulates pancreas, response is bicarbonate rich juices secreted
CCK: responds to fat or protein in S.I., secreted from intestinal wall, stimulates gallballder, response is bile secreted into duodenum, and also stimulates pancreas, responses is bicarbonate and enzyme rich juices secreted into S.I.