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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.
LH and FSH are secreted from cells in the anterior pituitary gland, and are called gonadotropins because of their role in stimulating the gonads. The principle regulator of LH and FSH secretion is gonadotropin-releasing hormone (GnRH). GnRH is secreted from the hypothalamus.GnRH stimulates secretion of LH and FSH, which in turn stimulates gonadal secretion of the sex steroids testosterone, estrogen and progesterone (see diagram at left).nRH is secreted from the hypothalamus. GnRH stimulates secretion of LH and FSH, which in turn stimulates gonadal secretion of the sex steroids testosterone, estrogen and progesterone (see diagram at left).