Secretin
Secretin is secreted by S cells in the upper pa of the small intestine. Secretin increases the secretion of bicarbonate by the pancreas. It also augments the action of CCK. It decreases gastric acid secretion and May cause contraction of pyloric sphincter.(Ref: Ganong&;s Review of medical physiology, 23 rd edition, page 446 )
Reduces the action of CCK PZ
Reduces Gastric secretion
Increases Gastric secretion
Relaxation of pyloric spincter
G.I.T