Now, to prevent the hydrochloric acid from the stomach from damaging the intestinal mucosa, enteroendocrine cells also secrete another hormone, called secretin, which stimulates the pancreatic duct cells to secrete water and bicarbonate.

为了避免胃部产生的胃酸对小肠粘膜造成损伤，小肠内分泌细胞还可分泌胰泌素；它可以刺激胰腺导管细胞分泌水和碳酸氢盐。