EDS200H5 Chapter Notes - Chapter 17: Prefrontal Cortex, Explicit Memory, Macular Degeneration
Document Summary
Chapter 17-physical and cognitive development in late adults. Evolutionary theory: natural selection has not eliminated many harmful conditions and non- adaptive characteristics in older adults. Cellular clock theory: cells can divide a maximum of about 75-80 times, and that as we age, our cells become increasingly less capable of dividing. Free-radical theory: people age because inside their cells" normal metabolism produces unstable oxygen molecules know as free radicals. These molecules ricochet around inside cells, damaging dna and other cellular structures. Mitochondrial theory: states that aging is due to the decay of mitochondria. It appears that this decay is primarily due to oxidative damage and loss of critical micronutrients supplied by the cell. Hormonal stress theory: aging in the body"s hormonal system can lower resilience to stress and increase the likelihood of disease. The course of physical development in late adulthood.
