Life-span development chap 4 notes

I. Prenatal Development A. Germinal Period - Conception to 2 weeks 1. Creation of the zygote 2. Continued cellular telephone division 3. Implantation - bond of the zygote to the uterine debate (10 age later founding) * blastodermic vessicle - inner cells (embryo) * Trophoblast - erupter forge (placenta/umbilical cord cord - life supports systems) B. Embryonic Period - 2 to 8 weeks after conception 1. cellular phone differentiation intensifies, support systems for cells design and organs appears 2. committed zygote becomes embryo * Endoderm (digestive/respiratory systems) * mesoblast (circulatory system, bones, muscles, excretory system, rejoinder system) * ectoblast (nervous system sensory receptors, pare parts such as hair and nails) C. fetal Period - 8 weeks after conception until birth 1. Fetal size increases and organs engender functioning 2. Reflexes appear and thither is cozy differentiation D. Miscarriage and Abortion 1. Most occur deep down 1st trimester (chromosomal abnormalities) 2. 15-20% pregnancies expiry in miscarriage * male fetuses more likely to miscarry 3. Abortions sub judice in U.S. until stamp out of 2nd semester * 1 automatic stillbirth for every 2 births * cast-off(prenominal) pregnancies stressful for woman disregardless of how it is resolved * Psychological effects of abortion include relief and depravity (usually mild and disappears) * Women with previous psychiatric problems more likely to receive adverse effects II. Teratology and Hazards to Prenatal Development A. Teratogen - whatsoever agent that yards birth defects 1.

Environmental Hazards * actinotherapy (chromosomal abnormalities) * Pollutants & toxic wastes (lead, pesticides, ascorbic virulent dioxide, mercury dangerous to fetus) * Drugs Thalidomide - appointed in 1960s for morning disease (deformed babies) Cocaine/heroin (addiction/withdrawal symptoms/neurological defects) Alcohol (fetal alcohol syndrome) Smoking (low birth weight, ADHD, handle births, SIDS) Marijuana, antibiotics, excessive vitamins, antihistamines, aspirin, diet pills harmful 2. Maternal diseases can cross the placenta barrier and micturate birth defects - Rubella (German measles)... If you postulate to get a prominent essay, order it on our website: Orderessay

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