8th Grade-Ch. 7 Sec. 3 The Human Life Cycle
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Transcript of 8th Grade-Ch. 7 Sec. 3 The Human Life Cycle
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Ch. 7 Sec. 3 The Human Life CycleObjectives:1.What are the stages of human development that occur before birth?2.How is the developing embryo protected and nourished?3.What happens during childbirth?4.What changes occur from infancy to adulthood?
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zygote embryo fetus
Up to 8 weeks
9 weeks birth
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zygote1. moves down fallopian
tube
2. begins 2 divide
3. forms hollow ball
4. attaches to uterus = embryo (from 2 cell stage 8th week)
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embryo
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fetal developmentMONTHS FETAL DEVELOPMENT
BY 3RD MONTH
•Looks like baby
•Internal organs (brain, etc) developing
4-6 MONTHS •Bones
•Heartbeat
•Movement
7-9 MONTHS •Fetus doubles in length
•Lungs develop
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protection & nourishment
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amniotic sac
• fluid filled sac that cushions & protects developing baby
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placenta• links embryo & mom- receives nutrients &
oxygen - gives off carbon dioxide & wastes
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umbilical cord• rope between fetus & placenta
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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
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Figure 14 pg. 237-Twins
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Fraternal twins are from 22 eggs & 22 sperm.
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Unlike identical twins, fraternal twins have their own placenta and amniotic sac, which prevents
them from actually touching each other.
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Triplets are born in about 1 out of every 7,000 births.
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infancy
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infancy
Shape & size change greatly
When born-head makes ¼ body
Dependent on others
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childhood
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childhood
Starts @ 2 yrs.
Bones & muscles grow
More coordinated
Language develops
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adolescence
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adolescence
Become adults physically & mentally
puberty-able to reproduce
Girls-ovulate & menstruate
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adulthood
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adulthood
After age 30-get wrinkles, muscles decrease
Puberty ends
Mental & emotional growth cont.
Become wiser