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Human Reproductive System Review

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Human Reproductive System Review Male Reproductive System Male Reproductive System Sperm Formation MEIOSIS forms sperm in gametes Sperm forms in testes Scrotum keeps ... – PowerPoint PPT presentation

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Title: Human Reproductive System Review


1
Human Reproductive System Review
2
Male Reproductive System
3
Male Reproductive System
4
Sperm Formation
  • MEIOSIS forms sperm in gametes
  • Sperm forms in testes
  • Scrotum keeps cooler than rest
  • Semen is sperm plus protecting fluid
  • Semen leaves testes through the vas deferens
    (sperm ducts) to the urethra before it exits.

5
Secondary Sexual Characteristics - Male
  • Produced by testosterone
  • Deeper voice
  • Chest and facial hair
  • Lengthen bones
  • Increased size of testes for sperm production

6
Female Reproductive System
7
Female Reproductive System
8
Ovum Formation
  • MEIOSIS forms the eggs (ova)
  • Eggs are formed before birth
  • 1 egg per month is matured and released from
    ovaries, most of the time
  • Eggs travel through the fallopian tube where they
    may become fertilized

9
Secondary Sexual Characteristics - Female
  • Induced by increased LH, FSH, estrogen, and
    progesterone hormone levels
  • Pubic hair
  • Widen pelvis
  • Enlarge mammary tissue (breasts)
  • Begin menstrual cycles

10
Menstrual Cycle - Female
11
Fertilization
  • Occurs in upper 1/3 of Fallopian tube
  • Only 1 sperm can fertilize an egg
  • Fertilized egg zygote
  • An average woman is pregnant (gestational period)
    for 9 whole months. That is 40 weeks. Babies
    can survive if they are born earlier, but they
    may have complications due to being premature.

12
Implantation
  • Fertilized eggs are implanted into thick walls of
    uterus
  • Chorion membranes dig into uterus to form
    placenta
  • Zygote grows into an embryo
  • Embryo gets air and nutrients through the
    umbilical cord
  • Once pregnant, progesterone levels stay high in
    mom
  • Moms uterus grows with the baby

13
1st Trimester 1st 12 weeks
  • Heart develops first
  • Neural tube develops
  • All body systems appear by Week 8 Now a Fetus

14
2nd Trimester up to 24 weeks
  • Most growth
  • Looks more like a baby
  • Some preemies survive at this stage

15
3rd Trimester Up to 40 weeks
  • More growth
  • Kicking, rolling, stretching
  • Eyes open Week 32
  • Lungs mature
  • Rotates to head-down
  • position, unless baby is breech

16
Birth
  • Labor
  • Uterine contractions begin
  • Cervix dilates to 10 cm.
  • Birth
  • Uterus pushes baby through vaginal canal
  • Placenta delivered after baby
  • Cesarean Section (c-section) is a surgery that
    cuts through the uterus to deliver the baby if it
    cannot be born vaginally
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