Human Reproductive System - The Human Reproductive System...

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The Human Reproductive System
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Male Reproductive System scrotum testis/testes epididymis vas deferens Cowper’s gland rectum seminal vesicles urinary bladder prostate gland urethra penis
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Male Reproductive System (frontal view) See p. 62 in Review book
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Male Reproductive System 1. Scrotum – sac of skin that holds testes. Hangs below body to keep testes cool. Sperm cannot be produced if body is too warm. Testes move into scrotum just before birth. 2. Testis/testes – male gonads. Made up of small, coiled tubes – seminiferous tubules. 300-600 per testis. Immature sperm made here. Secrete testosterone
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Male Reproductive System 3. Epididymis – storage area in upper rear of testis. Immature sperm move here to mature – takes 18 hours. 4. Vas deferens – tube that leads upwards from each testis into lower part of abdomen from epididymis. 5. Cowper’s gland – produces fluids that nourish sperm and protect them from the acidity of female. Combination of sperm and fluids - semen
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Male Reproductive System 6. Rectum – holds wastes 7. Seminal vesicles – same job as Cowper’s gland 8. Urinary bladder – stores urine 9. Prostate gland – same job as Cowper’s gland and seminal vesicles 10. Urethra – passageway for excretion of urine and for sperm to leave body. Vas deferens empties into urethra
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Male Reproductive System 11. Penis – male reproductive organ. Facilitates internal fertilization Ejaculation – muscular contractions force semen through urethra. Before, during and after ejaculation reflex actions keep outlet of bladder closed
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Hormones and Negative Feedback in Males Negative Feedback – change that leads to a response that causes something to counteract that change Luteinizing Hormone (LH) – stimulates testes to produce testosterone Testosterone – stimulates development of sperm. Once there is a large number of sperm, puberty is complete.
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Hormone Negative Feedback System
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What is the effect of high levels of LH? Testosterone is produced What is the effect of high levels of testosterone?
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