PSYA02H3 Lecture : Chapter notes
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PSYA02H3 Full Course Notes
Verified Note
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Document Summary
Growing older is a matter not only of aging, but also of changing personally, intellectually and socially. Lifespan developmental psychology studies the processes and the patterns of change that occur within an individual over a life"s course. Prenatal period the 9 months between conception and birth. This period is divided into 3 developmental stages: the zygotic, the embryonic and the fetal. The length of a normal pregnancy is 266 days or 38 weeks. Zygote stage the first stage of prenatal development, during which the zygote divides many times and the internal organs begin to form. By the end of the first week, it consists of about 100 cells. Many of them are arranged in 2 layers, one for the skin, hair, nervous system and sensory organs and the other for the digestive and respiratory systems and glands. Near the end of the stage, a third layer appears that eventually develops into muscles and the circulatory and excretory systems.
