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Reproductive Systems and Fertilization

Reproductive Systems and Fertilization. Ms. Law Health and Medical Sciences. Meiosis Review. How sperm and eggs are produced. Male Reproductive System. Male Reproductive System. Function: To produce and deliver sperm to the female system Testes: Make sperm and testosterone.

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Reproductive Systems and Fertilization

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  1. Reproductive Systems and Fertilization Ms. Law Health and Medical Sciences

  2. Meiosis Review • How sperm and eggs are produced.

  3. Male Reproductive System

  4. Male Reproductive System • Function: To produce and deliver sperm to the female system • Testes: Make sperm and testosterone Inside scrotum To Regulate temperature. Why? Male sex hormone Not until puberty Produces secondary sex characteristics-deeper voice, pubic hair, facial hair, body hair

  5. Journey of the Sperm • Inside testes are Semineferous Tubules where sperm are produced through meiosis • Mature sperm leave and are stored in theEpididymous • Sperm leave Epididymousthey travel through the Vas Deferens where fluid is added to them • Sperm + Fluid=Semen • Vas Deferens is connected to the Urethra. During Ejaculation the sperm travel from the Vas Deferens to the Urethra then are ejaculated

  6. Journey of the Sperm • Testes in ScrotumSemineferous Tubules (produce sperm)Epididymous (store sperm)Vas Deferens (fluids added)urethraSemen (sperm + fluids) ejaculated

  7. Female Reproductive System

  8. Female Reproductive System • Function: produce eggs, nuture fertilized eggs, give birth • Ovaries: Mature eggs and produce estrogen Female Sex Hormone Girls are born with all of their eggs, but do not start to mature until puberty Produces secondary sex characteristics

  9. Journey of the Egg • Ovary releases an Egg into the Fallopian Tube (Ovulation) • Egg travels down the Fallopian Tube towards the uterus • If fertilized, egg will implant in wall of uterus and begin to grow into a baby • If NOT fertilized, egg will die and be flushed away with menstruation (period).

  10. Journey of the Egg • OvaryFallopianTube Uterus (thickened with blood and tissue to prepare for fertilization) Fertilized-egg will implant in wall of uterus and begin to grow into a baby Unfertilized-egg will die and be flushed out with menstruation (period)

  11. Fertilization • Occurs in the fallopian tube • Egg is released during ovulation • Sperm is released into vagina by ejaculation during sexual intercourse • Sperm swim through uterus toward fallopian tubes • Egg and sperm join nuclei during fertilization • Egg (23 chromosomes)+ Sperm (23 chromosomes)= Zygote (46 chromosomes) • Egg blocks more than one sperm from entering

  12. Fertilization

  13. Fertilization

  14. Embryo Development • After fertilization, zygote travels to uterus where it implants-attaches to the wall • Fertilized egg is dividing over and over • Now called an embryo • Placenta forms-provides the baby with oxygen and nutrients from mom’s blood and removes waste

  15. Embryo Development • Embryo is surrounded by the amnionfluid filled sac protects the baby • Umbilical cord forms and attaches to placenta-exchange of oxygen nutrients and wastes • Mom’s blood and baby’s blood never actually mix!

  16. Embryo Development

  17. Embryo Development

  18. Embryo Development • 1-2 months  brain, spinal cord, limb buds • 3-6 months  Movement, fingernails, toenails, eyes, can hear sounds outside the womb • 7-9 months  lungs practice breathing, see light, sleeping patterns • 9-10 months  Birth

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