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The Reproductive System

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Western University
Physiology 1021
John Ciriello

11th Week July1711 1056 AM Module 14The Reproductive SystemThe combined functions of both male and female reproductive systems are to pass on the genes yof the individuals and to maintain the speciesThe Reproductive SystemFetal Development of the Reproductive SystemEach cell in the body contains 23 pairs of chromosomesthis includes a pair of sex chromosomesy The sex chromosomes consists of a large X chromosome and a smaller Y chromosomesy All eggs contain an X chromosome while the sperm can carry either and X or a Y chromosomey The sex of the future baby is determined at the point of fertilizationif a sperm is carrying the X ypenetrates the egg also carrying an Xthen a female will develop XXIf a sperm is carrying a Y fertilizes the X chromosome bearing egg then a male will develop XYy Development of each reproductive tract DOES NOT begin immediately after fertilization yCONTDDuring the first 6 weeks of developmentmale and female embryos contain common ysometimes indifferent gonads These structures will eventually form the testes in male or ovaries in femaleyThere are 2 sets of primitive reproductive tracts1 The mesonephric or Wolffian Duct 2 The paramesonephric or Mullerian Duct Fetal Development of the Reproductive SystemIn the developing male embryoat roughly 67 weeks the presence of the Y chromosome causes ythe indifferent gonads to develop into the testes In the developing female embryoat about 9 weeks of development the XX chromosomes are yactivated and ovaries develop Once the testes or ovaries have developed the reproductive tracts and external genitalia follow yCONTDIn the developing male fetusat 7 weeks testicular cells begin to produce mullerian inhibiting yhormone MIH which causes the Mullerian duct to regress Then at 9 weeks testicular cells begin to produce testosteroney This small surge in testosterone stimulates the Wolffian duct to develop into the epidiymis vas ydeferens seminal vesicles and the urethra The presence of testosterone also causes the development of the male external genitaliay
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