Final answer:
G-cells in the gastric glands produce gastrin, a hormone that stimulates stomach secretions and motility. Gastrin is released in response to proteins in the stomach and stimulates the secretion of gastric acid. Other hormones involved in digestion include secretin and cholecystokinin.
Step-by-step explanation:
G-cells of the gastric glands in the stomach produce a hormone called gastrin that stimulates stomach secretions and motility. Gastrin is released in response to the presence of proteins in the stomach and it stimulates the secretion of gastric acid by the parietal cells of the stomach mucosa. This acid helps in the digestion of proteins. Other hormones involved in the digestive process include secretin, which stimulates the secretion of bicarbonate by the pancreas, and cholecystokinin (CCK), which stimulates the secretion of pancreatic enzymes and bile.