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3. Stages of Development
Pre-Embryonic DevelopmentPre-Embryonic Development
FertilizationFertilization
CleavageCleavage
Embryonic DevelopmentEmbryonic Development
GastrulationGastrulation
OrganogenesisOrganogenesis
Fetal DevelopmentFetal Development
Pregnancy Understanding
35. Fig. 46-18
Estradiol Oxytocin
from
ovaries
Induces oxytocin
receptors on uterus
from fetus
and mother’s
posterior pituitary
Stimulates uterus
to contract
Stimulates
placenta to make
Prostaglandins
Stimulate more
contractions
of uterus
Positivefeedback
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Pregnancy Understanding
36. References
• Pregnancy Tips: Trying to Conceive or
Trying to get Pregnant
• Wikipedia
• Discussion with physician
• Pregnancy Miracle