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Reproduction

Reproduction. Testis. Spermatogensis – Be able to outline the process. The role of LH, teststerone and FSH in spermatogenesis. Human Ovary – structure and function. Oogenesis. Draw and label a diagram of a mature sperm and egg. Semen Production – role players.

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Reproduction

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  1. Reproduction

  2. Testis

  3. Spermatogensis – Be able to outline the process

  4. The role of LH, teststerone and FSH in spermatogenesis

  5. Human Ovary – structure and function

  6. Oogenesis

  7. Draw and label a diagram of a mature sperm and egg

  8. Semen Production – role players • 3 main structures play a role • Epididymis – storage/holding area where sperm mature and become fully motile • Seminal vesicle and prostate gland – produce, store and expel fluid during ejaculation • Fluid mixes with sperm to increase volume of ejaculate; s.v. fluid contains nutrients (including fructose) and mucus (protection); • Fluid from p.g. contains mineral ions, and is alkaline (protection)

  9. Spermatogenesis vs. Oogenesis • Guys • Millions daily • Released during ejaculation • Starts during puberty • Production continues throughout adult life • Four functional gametes per meiosis • Girls • 1/28 days • Released via ovulation • Starts prenatally • Stops at menopause • 1 functional gamete per meiosis

  10. Fertilization

  11. The process of fertilization – acrosomalrxn, sperm penetration, cortical rxn

  12. Hormonal Control of Pregnancy – esp HCG • Estrogen and progesterone – needed to stimulate the development of uterine lining throughout pregnancy. • Secreted by corpus luteum (c.l.) for first week following fertilization • Following implantation embryo secretes HCG = prevents degeneration of c.l. = continued secretion of est. and progest. • C.l. degenerates middle of term, placental cells now produce est. and progest. Until end of pregnancy

  13. Outline - Stages of Early Embryological Development

  14. Structure and Function of Placenta

  15. Placenta cont’d • The placenta is about 9 inches in length, and about 1 inch thick. It weighs no more than 1 pound. It is a darkish red/blue or marroon color. It connects to the fetus by the umbilical cord.The placenta connects the developing fetal tissues to the uterine wall, supplying the fetus with maternal nutrients. It also produces progesterone and other important pregnancy hormones

  16. Material exchange btw fetal and maternal blood

  17. Fetus – supported and protected by amniotic sac and fluid

  18. Outline – Birth & its hormonal control • The process – • Role of progesterone – • Role of oxytocin (positive feedback example)

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