sep10 - Ch.8 human development I. definition of development...

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Ch.8 human development I. definition of development A. development sequence of age related changes that occur between conception and death II. Prenatal Development A. prenatal period: stage of development between conception and birth B. stages of prenatal development i. germinal stage a) conception – implantation: b) approximately first 2 weeks c) zygote: a single celled fertilized egg d) Blastocyst: a bundle of cells e) stage ends when blastocyst implants on uterine wall ii. 3 crucial support structures form after implantation a) amniotic sac filled with amniotic fluid regulates exchange of fluids, cushions against environmental shock and temperature changes b) placenta passes oxygen and nutrients from mother to baby, gets rid of waste iii. embryonic stage a) 3 rd to 8 th week b) called an embryo c) placental barrier is semi-permeable teratogens, agents (ex. Chemicals, viruses) that can cause harm to prenatal organism Fetal Alcohol Syndrome (FAS): physical and cognitive abnormalities in children of women who drank heavily during pregnancy d) organogenesis: all major organ systems are formed e) sexual differentiation begins f) miscarriages most common in this stage iv. fetal stage a) from 2 nd month until birth b) called a fetus c) rapid growth occurs d) maturing of organ systems age of viability 22-26 weeks age at which fetus can survive outside of womb
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This note was uploaded on 11/15/2010 for the course PSYCH 36-087 taught by Professor Welsh during the Fall '10 term at University of Georgia Athens.

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sep10 - Ch.8 human development I. definition of development...

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