Life-span development chap 4 notes

I. Prenatal Development A. Germinal Period - Conception to 2 weeks 1. Creation of the fertilized ovum 2. Continued cellular telephone division 3. Implantation - bail of the zygote to the uterine bulwark (10 age later founding) * blastodermic vessicle - inner cells (embryo) * Trophoblast - step uper class (placenta/umbilical cord cord - life supports systems) B. Embryonic Period - 2 to 8 weeks after conception 1. cellphone differentiation intensifies, support systems for cells take in and organs appears 2. committed zygote becomes embryo * Endoderm (digestive/respiratory systems) * mesoblast (circulatory system, bones, muscles, excretory system, rejoinder system) * ectoderm (nervous system sensory receptors, flake off parts such as hair and nails) C. fetal Period - 8 weeks after conception until birth 1. Fetal size increases and organs bulk functioning 2. Reflexes appear and thither is sexual differentiation D. Miscarriage and Abortion 1. Most occur indoors 1st trimester (chromosomal abnormalities) 2. 15-20% pregnancies expiry in miscarriage * male fetuses more likely to miscarry 3. Abortions heavy in U.S. until stamp out of 2nd semester * 1 offhand 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 psychiatrical problems more likely to flummox adverse effects II. Teratology and Hazards to Prenatal Development A. Teratogen - whatsoever agent that yards birth defects 1.

Environmental Hazards * radiation (chromosomal abnormalities) * Pollutants & toxic wastes (lead, pesticides, ascorbic savage dioxide, mercury dangerous to fetus) * Drugs Thalidomide - dictate in 1960s for morning complaint (deformed babies) Cocaine/heroin (addiction/withdrawal symptoms/ neurologic defects) Alcohol (fetal alcohol syndrome) Smoking (low birth weight, ADHD, premature births, SIDS) Marijuana, antibiotics, excessive vitamins, antihistamines, aspirin, diet pills harmful 2. Maternal diseases sewer cross the placenta barrier and ready birth defects - Rubella (German measles)... If you motive to get a heavy(a) essay, order it on our website: Ordercustompaper.com

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