Theories of Aging

Normal process of changes in the body over time

Scientists have been able to double life span of fruit flies by selective breeding

Cells divide 80-90 times then stop. Older cells divide less Continue to live, but do NOT function properly causing:
-slower wound healing -osteoporosis -aging skin *so far the best explanation of cause and process of aging.

Molecules in cells bind together which causes the normal cell function to slow. Collagen--connective tissue in most body systems changes with age. Causes loss of elasticity in -blood vessels -muscle tissue -skin -slower wound healing -wrinkles -lens of eye -increased size of nose and ears

Immune system becomes defective -attacks not only basteria and viruses, but begins producing antibodies against itself. -does not explain why it happens or why it does not happen to all older adults.

-organs and system wear out over time. Cells wear out and cannot repair damaged components. -ares typically effected are muscle, heart and nervous systems. -may wear out faster if impacted by external stressors: fall, push, car accidents

-decrease calorie intake by 40% -requires meticulour nutrition -low calorie diets slow lower your body temp. and slow your metabo. this reduces number of free radicals created which may slow aging. -rats lived 30% longer(currently testing primates)

Highly reactive chemical compounds that have an unpaired electron -causes cross linkage -reactions continue until free radicals pair with each other or mett and antioxidant(good)

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