Reproductive Hormones

Reproductive - 8.5 Reproductive Hormones The Male Reproductive System Castration is a process in which the testes are removed Castrated

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8.5: Reproductive Hormones The Male Reproductive System Castration is a process in which the testes are removed Castrated individuals/animals lack sex drive and are sterile (cannot reproduce to have children) The hormones androsterone and testosterone are produced in the interstitial cells of the testes The interstitial cells of the testes are found in the seminiferous tubules of the testes Spermatogenesis: the process in which spermatogonia divide and become mature sperm cells Testosterone is the hormone that stimulates the beginning of spermatogenesis Testosterone also stimulates the development of male characteristics at puberty like: facial and body hair, maturation of the testes and penis, growth of the larynx which causes boys at puberty to have a lower voice As well, testosterone increases the secretion of body oils which causes skin acne in the beginning of puberty but when males adjust to higher levels of testosterone, skin acne declines The male testes produce sperm everyday and sperm production doesn’t decline Negative feedback systems ensure adequate levels of sperm cells and testosterone levels The pituitary gland produces and stores the gonadotropic hormones : follicle-stimulating hormone (FSH) and luteinizing hormone (LH)
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FSH in males regulates the production of sperm cells in the seminiferous tubules while LH regulates the production of testosterone by the testes At puberty, the hypothalamus secretes gonadotropic-releasing hormone (GnRH) GnRH activates the pituitary gland secrete and release FSH and LH FSH acts directly on the sperm producing cells of the seminiferous tubules while LH stimulates the testes to produce testosterone Once testosterone levels increase, a negative feedback system is activated by the hypothalamus This results in less secretions of GnRH which then reduces the release of LH This leads to less testosterone production and levels are back to normal The Female Reproductive System One egg matures each month, more complicated reproductive system than
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This note was uploaded on 02/05/2011 for the course PHYS 1010 taught by Professor Tomkirchner during the Spring '11 term at York University.

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Reproductive - 8.5 Reproductive Hormones The Male Reproductive System Castration is a process in which the testes are removed Castrated

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