A&P 17

A&P 17 - Chapter 17/18 Reproduction Determination of sex 2 of the 46 human chromosomes are involved in gender determination Called sex

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Chapter 17/18: Reproduction Determination of sex 2 of the 46 human chromosomes are involved in gender determination. Called sex chromosomes X and Y Are not truly homologous because they contain different sets of information X carries more information than just that needed for gender determination. Blood-clotting, color vision, etc. Y carries only information regarding maleness. Contains SRY (Sex-determining Y) gene SRY encodes for testes determining factor (TDF) The presence of this gene leads to the development of a male, the absence leads to the development of a female.
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Male Reproductive System The Testes Produce sperm and the male sex hormones Located outside of the abdominal cavity within the scrotum Anatomy of a Testis Enclosed by a fibrous capsule Divided into lobules that each contain one to three seminiferous tubules Seminiferous tubules contain cells that produce sperm Interstitial cells produce androgens
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Testes and Sperm
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Maturation of Males Between 11-14 years of age in males, the hypothalamus releases GnRH. GnRH stimulates the pituitary to release LH and FSH. LH is also called interstial cell-stimulating hormone (ICSH) in males. LH stimulates the production of testosterone by the testes. FSH stimulates the production of sperm cells.
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Spermatogenesis Production of sperm Includes the process of meiosis Two types of cells in the seminiferous tubules: Germ cells – involved in spermatogenesis Spermatogonia Primary spermatocytes Secondary spermatocytes Spermatids Sertoli cells – support, nourish, and regulate the development of cells undergoing spermatogenesis Spermatogenesis must occur at 4-7 degrees below body temperature
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Spermatogenesis
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Sperm Spermatids mature into spermatozoa (sperm) Sperm have three distinct parts: Head – contains a nucleus covered by the acrosome that releases the enzyme acrosin. Acrosin breaks down the barrier surrounding the
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This note was uploaded on 11/26/2011 for the course PHY 220 taught by Professor Thomas during the Summer '10 term at N.C. State.

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A&P 17 - Chapter 17/18 Reproduction Determination of sex 2 of the 46 human chromosomes are involved in gender determination Called sex

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