Ch27_Reproduction

Ch27_Reproduction - Reproductive system Functions of the...

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Reproductive system
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Functions of the reproductive system • Production of gametes (reproductive cells) and hormones • Fertilization •M a l e – Sperm production, transport of sperm to the uterus • Female – Ova production, fusion of gametes, development of the zygote
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Fig 27.1 The scrotum is a pouch of skin Inside the scrotum there are two scrotal cavities that each contain a testis Male reproductive system
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Fig 27.1
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Fig 27.3 Regulate the temperature of the testis-sperm develop 1.1°C below body temp
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Fig 27.4
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Fig 27.7
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Fig 27.7 Sperm is produced in the seminiferous tubules of the testis
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Fig 27.5 There is about one mile of seminiferous tubule in men This allows men to produce about 500,000,000 sperm/day
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Fig 27.5 lumen
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Sperm production • Spermatogonia-stem cells that develop into spermatids • Become active at puberty • Spermatogenesis- production of spermatids • Occurs in the seminiferous tubules of the testis Fig 27.5
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Spermiogenesis • Anatomical maturation of sperm cells •A s i n g l e Spermatid develops into a Spermatozoon • Occurs in the seminiferous tubules of the testis Fig 27.6
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Sustentacular cells in seminiferous tubules • Maintain the blood testis barrier – Allows the sperm to develop is an environment that is different from the general circulation • Release the hormone Inhibin • Inhibin-stops production of FSH in the anterior pituitary
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Hormones • Follicle-stimulating hormone-supports sperm production • Luteinizing hormone-stimulates interstitial cells of the testis to release testosterone
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• Interstitial cells of the testis release testosterone • Testosterone- • Promotes production of mature sperm • Maintain accessory organs (glands) of the reproductive tract • Influences secondary sexual characteristics – Facial hair, muscle mass, body fat
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Sperm development • FSH, LH,& Testosterone, promote sperm production • Inhibin inhibits sperm production
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Fig 27.5 lumen
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This note was uploaded on 11/10/2011 for the course PDBIO 220 taught by Professor Tomco during the Winter '09 term at BYU.

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Ch27_Reproduction - Reproductive system Functions of the...

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