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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.
Most hormones are secreted from endocrine glands. An endocrine gland is a ductless gland in which glandular cells secrete hormones directly into the bloodstream and interstitial fluid. Pancreas-is both and endocrine and exocrine gland.Exocrine glands are not part of the endocrine system.x. glucagon and insulin are antagonistic hormones. Glucagon promotes the release of glucose to the bloodstream from stored glycogen by a process called signal transduction. Insulin promotes the removal of glucose from the bloodstream for storage as glycogen by a process called signal transduction.