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ch 4 - Elizabeth Hight Psych September 6 2007 Chapter Four...

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Elizabeth Hight Psych September 6, 2007 Chapter Four A. Learning Goal One a. What is the course of prenatal development? i. There are three stages involved with prenatal development. The first stage is called the germinal period. This period takes place in the first two weeks after conception. During this period the cell becomes a zygote, the cell divides, and attaches to the uterus wall. Next is the embryonic period, and this period occurs from weeks two to eight. Cell division intensifies, cell support systems form, and organs appear. Last is the fetal period, and this period is from two months to seven months. Moving arms and legs form, skin, toenails, eyes, eyelids are also formed. b. What are some of the main hazards to prenatal development? i. Teratogens can cause birth defects and alter cognitive and behavior issues. Teratogens are drugs, incompatible blood types, pollutants, stress, diseases, and nutritional problems. Also harming the unborn child are many prescription and nonprescription drugs- especially antibiotics.
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