8th Grade-Ch. 7 Sec. 3 The Human Life Cycle
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  • 1. Ch. 7 Sec. 3 The Human Life Cycle
    • Objectives:
    • What are the stages of human development that occur before birth?
    • How is the developing embryo protected and nourished?
    • What happens during childbirth?
    • What changes occur from infancy to adulthood?
  • 2.  
  • 3. zygote  embryo  fetus Up to 8 weeks 9 weeks  birth
  • 4. zygote
    • moves down fallopian tube
    • begins 2 divide
    • forms hollow ball
    • attaches to uterus = embryo (from 2 cell stage  8 th week)
  • 5. embryo
  • 6. fetal development MONTHS FETAL DEVELOPMENT BY 3 RD MONTH
    • Looks like baby
    • Internal organs (brain, etc) developing
    4-6 MONTHS
    • Bones
    • Heartbeat
    • Movement
    7-9 MONTHS
    • Fetus doubles in length
    • Lungs develop
  • 7. protection & nourishment
  • 8. amniotic sac
    • fluid filled sac that cushions & protects developing baby
  • 9. placenta
    • links embryo & mom- receives nutrients & oxygen - gives off carbon dioxide & wastes
  • 10. umbilical cord
    • rope between fetus & placenta
  • 11. 3 stages of birth 1.labor 2.delivery 3.afterbirth
    • contractions
    • cervix gets
    • bigger
    baby pushed out uterus  vagina  mom’s body placenta/ membranes come out
  • 12.  
  • 13. Figure 14 pg. 237-Twins
  • 14.  
  • 15. Fraternal twins are from 2 eggs & 2 sperm.
  • 16. Unlike identical twins, fraternal twins have their own placenta and amniotic sac, which prevents them from actually touching each other.
  • 17. Triplets are born in about 1 out of every 7,000 births.
  • 18. infancy
  • 19. infancy Shape & size change greatly When born-head makes ¼ body Dependent on others
  • 20. childhood
  • 21. childhood Starts @ 2 yrs. Bones & muscles grow More coordinated Language develops
  • 22. adolescence
  • 23. adolescence Become adults physically & mentally puberty -able to reproduce Girls-ovulate & menstruate
  • 24. adulthood
  • 25. adulthood After age 30-get wrinkles, muscles decrease Puberty ends Mental & emotional growth cont. Become wiser 