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Human Reproduction and Development

Human Reproduction and Development - in turn develop into...

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Human Reproduction and Development Human reproduction employs internal fertilization, and depends on the integrated action of hormones , the nervous system , and the reproductive system. Gonads are sex organs that produce gametes. Male gonads are the testes , which produce sperm and male sex hormones. Female gonads are the ovaries , which produce eggs (ova) and female sex hormones. The Male Reproductive System Testes are suspended outside the abdominal cavity by the scrotum , a pouch of skin that keeps the testes close or far from the body at an optimal temperature for sperm development. Seminiferous tubules are inside each testis, and are where sperm are produced by meiosis. About 250 meters (850 feet) of tubules are packed into each testis. Spermatocytes inside the tubules divide by meiosis to produce spermatids that
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Unformatted text preview: in turn develop into mature sperm. Spermatogenesis Sperm production begins at puberty at continues throughout life, with several hundred million sperm being produced each day. Once sperm form they move into the epididymis , where they mature and are stored. Male Sex Hormones The anterior pituitary produces follicle-stimulating hormone (FSH) and luteinizing hormone (LH) . Action of LH is controlled by the gonadotropin-releasing hormone (GnRH) . LH stimulates cells in the seminiferous tubules to secrete testosterone , which has a role in sperm production and developing male secondary sex characteristics. FSH acts on cells to help in sperm maturation. Negative feedback by testosterone controls the actions of GnRH....
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