(4) Hormonal Regulation of the Reproductive System 2.pdf - Reproductive System Hormonal Regulation of the Reproductive System n n Section 9.4 Both male

(4) Hormonal Regulation of the Reproductive System 2.pdf -...

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8/25/16 1 Hormonal Regulation of the Reproductive System Section 9.4 Reproductive System n Both male and female reproductive systems include a pair of gonads (testes or ovaries). n Gonads are organs that produce: ¡ Reproductive cells (sperm in males and eggs in females) ¡ Sex hormones that regulate the reproductive system Maturation of the Male Reproductive System n The male reproductive system is not mature until puberty. n At puberty: ¡ The hypothalamus increases the production of gonadotropin-releasing hormone (GnRH) ¡ GnRH acts on the anterior pituitary gland to release follicle-stimulating hormone (FSH) and luteinizing hormone (LH). FSH and LH in Males n FSH causes the seminiferous tubules in the testes to produce sperm n LH causes the interstitial cells in the testes to release the hormone testosterone . n Testosterone acts on tissues to complete the development of the sex organs and secondary sex characteristics (facial hair, muscle development, etc.) Negative Feedback n Hormone feedback loops control sperm production and maintain secondary sexual characteristics. n FSH also causes the seminiferous tubules to release the hormone inhibin . ¡ Inhibin acts on the anterior pituitary to inhibit the production of FSH n As FSH levels drop, the testes release less inhibin.
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  • Winter '16
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