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Reproduction

  • The seminiferous tubules within the testes are the site of sperm production.
  • Spermatogenesis is the process of sperm production. One primary spermatocyte yields four spermatozoa.
  • Oogenesis is discontinuous, with development arrested during prophase I and again in meiosis II. One primary oocyte yields one ovum plus polar bodies.
  • The first half of the menstrual cycle is the follicular phase. Under the influence of follicle stimulating hormone (FSH), a primary oocyte matures within the follicle.
  • The developing follicles produce estrogen, which stimulate the proliferation of the endometrium.
  • An LH surge precedes ovulation. At ovulation the follicle ruptures, releasing an ovum.
  • The second half of the cycle is the luteal phase. The ruptured follicle develops into a corpus luteum under the influence of luteinizing hormone (LH). The corpus luteum produces progesterone.
  • Progesterone maintains the endometrium and stimulates the development of glands within the endometrium. In the absence of pregnancy, the corpus luteum atrophies and the uterine lining is shed.
  • In males, FSH stimulates Sertoli cells, which play a role in sperm development. LH stimulates Leydig cells to produce testosterone.

Reproduction

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AP Biology Intro