![]() ![]() FSH and LH then stimulate the testis to produce testosterone. When testosterone levels are low, gonadotropin-releasing hormone (GnRH) is released by the hypothalamus, which in turn stimulates the pituitary gland to release FSH and LH. Hormone (FSH) and gonadotropin-releasing hormone (GnRH). Hormones involved are luteinizing hormone (LH), follicle-stimulating ![]() Each gland produces one or more hormones, which go on to target specific organs and tissues in the body. ![]() They are responsible for regulating metabolism, the immune system, maintaining blood. Pituitary, and testicular endocrine glands. The glands of the endocrine system are where hormones are produced, stored, and released. Adrenal glands are triangular-shaped glands situated above the kidneys. Testosterone regulation by cooperation between the hypothalamus, Testosterone, like all hormones, works via long distance signaling and is regulated by other hormones as illustrated below: ![]() In adult males, testosterone plays a key role in the development of reproductive organs and it promotes the secondary sexual characteristics of body and facial hair, increased muscle and bone mass, and a deep voice. Testosterone is a steroid hormone produced by all vertebrate animals and, in humans and other mammals, it is secreted in large amounts by the testes of males and to a much lesser extent, the ovaries of females. ![]()
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