GRT 3110 Chapter 7: GRT3110 Homework Week 7
22 Oct 2017
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Mme calment died 122, shigechiyo izumi 120. Aging is a natural process = changes during the lifespan (very diverse between individuals, mysterious biological phenomenon), loss of functioning, results in death. Senescence = natural deterior aging that doesn"t impact functioning (i. e. grey hair, decreased fertility, lung tissue loosing elasticity, atherosclerosis artery hardening) Early life expectancy rise due to environmental changes (i. e. better sanitation, vaccines, Theories of aging: programmed theories (biological timeline, damage/error theories antibiotics) (environmental) Programmed theories: programmed longevity (genes switch on and off, aging is those genes switching on), endocrine theory (biological clock through hormones), immunological theory (vulnerable to illness and immune system declines in age) Genetic coincidences between aging families? = genes impact aging and longevity (+ environment) Mediterranean sardinian peoples, small population shares many genes -- artery stiffness and positive emotions in the progenia project ( founder populations ) division of yeast cells; silencing gene that turns off other genes.
