HLTHAGE 1BB3 Chapter Notes - Chapter 5: Senescence, Menopause, Apoptosis
10 Jun 2016
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Document Summary
Maximum life span: maximum number of years a member of a species can live. Life expectancy: number of years at birth an average member of the population can expect to live. The gradual and progressive decay in physical function that begins in adulthood and ends in death in virtually all animal species. Intrinsic aging: changes within the body due to normal wear and tear , genetic mutations, and other internal sources of change. Extrinsic aging: changes due to external circumstances (e. g. effects of smoking) Senescence: normal decline that takes place in the body over time. People differ in effects of senescence on their body. Look at a person"s genes to find source of aging. Hayflick limit: number of cell divisions a cell can undergo in an organism before the cell dies. Phase ii phenomenon: cells take longer to double in number, waste accumulated in the cells, the cells gradually stopped dividing, and in the end the cells died.
