<span>The
hormones involved in gastric regulation are released from the stomach
and the small intestine. Gastrin has a stimulatory effect on parietal
cells and chief cells and is released in the presence of partially
digested peptides. The intestinal hormones, cholecystokinin and
secretin, have inhibitory effects on parietal cells and chief cells. In
addition, cholecystokinin release requires the presence of carbohydrates
and lipids.</span>
