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1 Ghrelin is secreted by endocrine cells in the stomach, especially when one is hungry and. 2  acts on the hypothalamus to stimulate feeding. 3  This action counteracts the inhibition of feeding by leptin and PYY3-36. Ghrelin is secreted by endocrine cells in the stomach, especially when one is hungry and. 2  acts on the hypothalamus to stimulate feeding. 3  This action counteracts the inhibition of feeding by leptin and PYY3-36.
Primary hormones secreted by the pancreas include: 1  Gastrin: This hormone aids digestion by stimulating certain cells in the stomach to produce acid. 2  Glucagon: Glucagon helps insulin maintain normal blood glucose by working in the opposite way of insulin.