Ans: The enterogastrone hormones are secreted by the duodenal mucosa, which is known as gastric epithelium or gastric surface epithelial metaplasia. This hormone starts to secrete in the small intestine or stomach when it encounters fatty food in the stomach or intestine. Also, it starts to release as an indicator for the pancreatic cells to secrete insulin to act upon the sugars and proteins present in the intestine.