8th Grade-Ch. 7 Sec. 3 The Human Life Cycle
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8th Grade-Ch. 7 Sec. 3 The Human Life Cycle

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8th Grade-Ch. 7 Sec. 3 The Human Life Cycle 8th Grade-Ch. 7 Sec. 3 The Human Life Cycle Presentation Transcript

  • 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?
  •  
  • zygote  embryo  fetus Up to 8 weeks 9 weeks  birth
  • zygote
    • moves down fallopian tube
    • begins 2 divide
    • forms hollow ball
    • attaches to uterus = embryo (from 2 cell stage  8 th week)
  • embryo
  • 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
  • protection & nourishment
  • amniotic sac
    • fluid filled sac that cushions & protects developing baby
  • placenta
    • links embryo & mom- receives nutrients & oxygen - gives off carbon dioxide & wastes
  • umbilical cord
    • rope between fetus & placenta
  • 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
  •  
  • Figure 14 pg. 237-Twins
  •  
  • Fraternal twins are from 2 eggs & 2 sperm.
  • Unlike identical twins, fraternal twins have their own placenta and amniotic sac, which prevents them from actually touching each other.
  • Triplets are born in about 1 out of every 7,000 births.
  • infancy
  • infancy Shape & size change greatly When born-head makes ¼ body Dependent on others
  • childhood
  • childhood Starts @ 2 yrs. Bones & muscles grow More coordinated Language develops
  • adolescence
  • adolescence Become adults physically & mentally puberty -able to reproduce Girls-ovulate & menstruate
  • adulthood
  • adulthood After age 30-get wrinkles, muscles decrease Puberty ends Mental & emotional growth cont. Become wiser 