Final answer:
Eating is initiated by the secretion of ghrelin from the stomach, which is a hormone that signals hunger.
Step-by-step explanation:
Eating is initiated by the secretion of ghrelin from the stomach. Ghrelin is a hormone that signals when you are hungry. It is one of the several hormones involved in the digestive process, which also includes gastrin stimulating the secretion of gastric acid, and cholecystokinin (CCK) stimulating the release of pancreatic enzymes and bile. These hormonal controls are crucial for the regulation of appetite and digestive processes, and they are secreted by endocrinocytes located in the stomach and small intestine.