PSY 2012 Lecture Notes - Lecture 20: Olfactory Bulb, Weight Gain, Object Permanence
Document Summary
Physical changes in early adulthood: peak physical development during 20s. Physical changes in middle and late adulthood: many physical changes in the 40s and 50s, involve changes in appearance. For most people, early adulthood marks the peak of physical health. From about 18 to 25 years of age: strength is greatest, reflexes are quickest, chances of dying from disease are minimal. During middle adulthood people gradually become aware of changes in their bodies: weight gain is common, sense organs become less sensitive, reactions to stimuli are slower. Cellular-clock theory: view that cells can divide a maximum of about 100 times, as we age, our cells become less capable of dividing. Free-radical theory: people age because unstable oxygen molecules known as free radicals are produced inside their cells, damage done by free radicals may lead to a range of disorders. Hormone stress theory: aging in the body"s hormonal system can lower resistance to stress and increase the likelihood of disease.
