10 下列何者會因小腸中出現酸性食糜而分泌？

胃抑素（gastric inhibitory polypeptide） 胃泌素（gastrin）

飢餓素（ghrelin） 胰泌素（secretin）

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Secretin is a hormone that controls the secretions into the duodenum, and also separately, water homeostasis throughout the body. It is produced in the S cells of the duodenum in the crypts of Lieberkühn.^[1] Its effect is to regulate the pH of the duodenal contents via the control of gastric acidsecretion and buffering with bicarbonate.

Gastric inhibitory polypeptide (GIP), also known as the glucose-dependent insulinotropic peptide is a member of the secretin family of hormones.

^{In humans, gastrin is a hormone that stimulates secretion of gastric acid (HCl) by the parietal cells of thestomach and aids in gastric motility.}

^{Ghrelin is a hormone produced mainly by P/D1 cells lining the fundus of the human stomach and epsilon cells of the pancreas that stimulates hunger.[1] Ghrelin levels increase before meals and decrease after meals.}