9-11 - Chapter10:HumanDevelopmentAcrosstheLifeSpan

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Chapter 10: Human Development Across the Life Span 19:32 Email: Marina about test:  marinak@uga.edu   9/11/08 CHAPTER 10: Human Development Across the Life Span Definition of Development: The sequence of age related changes that occur as a  person progresses from conception to death. Prenatal Development Prenatal period: stage of development between conception and birth Stages of prenatal development: Germinal stage: Conception-implantation; approximately first 2 weeks The women is made with all her eggs in her body and doesn’t gain more  during her lifespan. Men produce sperm cells throughout their lifetime.  Zygote: a single celled fertilized egg… formed in fallopian tubes, divides as it  travels, turns into a blastocyst.  Blastocyst: a bundle of cells Implants on uterine wall 3 crucial support structures form after implantation: Amniotic sac filled with amniotic fluid: Separates embryo from the mother, so fluid exchange is regulated. Amniotic fluid cushions against environmental shock and temp changes. Placenta: o Forms of cells on the uterine walls and cells from the embryo.  o Passes oxygen and nutrients from mother to baby, gets rid of waste (a  filter).  Umbilical cord: 
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Tube with blood vessels that carry blood between embryo and placenta. Embryonic stage: 
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9-11 - Chapter10:HumanDevelopmentAcrosstheLifeSpan

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