PSY 402 Chapter 2: Chapter 2 - Physical Changes

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Doing first part - p34-52, ignoring middle part - p52-61. Rate of living theories: there is a certain amount of energy we are given, and we spend it. Metabolic rates: slower metabolic rates in animals is correlated with longer life spans. Caloric intake: decreased caloric intake is associated with longer life spans. Example: in okinawa the residents only eat 60% of the normal japanese diet, have more people over 100 years of age per capita than the rest of japan. Stress adaptation: the body"s ability to deal with stress decreases with age. Cellular theories: point to causes of aging at the cellular level. Hayflick limit: cells can only divide a limited number of times. Telomeres become shorter with each replication, eventually become unable to replicate; Cross-linking: certain proteins in human cells interact randomly and produce molecules that are linked in such a way as to make the body stiffer; Collagen becomes stiffer as we age, much like a leather product.

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