Ch. 7 Sec. 3  The Human Life Cycle <ul><li>Objectives: </li></ul><ul><li>What are the stages of human development that occ...
 
zygote    embryo    fetus Up to 8 weeks 9 weeks   birth
zygote <ul><li>moves down fallopian tube </li></ul><ul><li>begins 2 divide </li></ul><ul><li>forms hollow ball </li></ul><...
embryo
fetal development MONTHS FETAL DEVELOPMENT BY 3 RD  MONTH <ul><li>Looks like baby </li></ul><ul><li>Internal organs (brain...
protection & nourishment
amniotic sac <ul><li>fluid filled sac that cushions & protects developing baby </li></ul>
placenta <ul><li>links embryo & mom- receives nutrients & oxygen - gives off carbon dioxide & wastes </li></ul>
umbilical cord <ul><li>rope between fetus & placenta  </li></ul>
3 stages  of birth 1.labor 2.delivery 3.afterbirth <ul><li>contractions </li></ul><ul><li>cervix gets  </li></ul><ul><li>b...
 
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 touchi...
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  
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7th Grade-Ch. 7 Sec. 3 The Human Life Cycle

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

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