PS102 Chapter Notes - Chapter 11: Social Contract, Egocentrism, Dishabituation
Document Summary
Development the sequence of age-related changes that occur as a person progresses from conception to death. Conception occurs when fertilization creates a zygote a one-celled organism formed by the union of a sperm and an egg. The prenatal period extends from conception to birth, usually encompassing nine months of pregnancy. The first phases of prenatal development, encompassing the first two weeks after conception. During the implantation process, the placenta begins to form. The placenta is a structure that allows oxygen and nutrients to pass into the fetus from the mother"s bloodstream, and bodily wastes to pass out to the mother. The second stage of prenatal development, lasting from two weeks until the end of the second month. Most of the vital organs and bodily systems begin to form in the developing organism, which is now called an embryo. The third stage of prenatal development, lasting from two months through birth.
