Gastrin is produced by:

Gastrin is a hormone which is produced by G cells in the lateral wall of glands in the antral portion of gastric mucosa. It is also found in pancreatic islets in fetal life, gastroinomas of pancreas, and pituitary gland, hypothalamus, medulla oblongata and in vagus and sciatic nerves. Actions- - Stimulation of gastric acid and pepsin secretion. - Stimulates growth of mucosa of stomach, small and large intestine. - Promotes gastric emptying - Stimulation of insulin secretion.