Wear-and-Tear theory
Aging associated changes are the result of chance damage accumulating over time.
Accumulative-Waste Theory
The buildup in cells of waste products that presumably interferes with metabolism.
Autoimmune Theory
Aging results from gradual decline of the body’s autoimmune system.
Cross-Linkage Theory
Aging results from accumulation of cross-linked compounds interfering with normal cell function.
Free-Radical Theory
Free radicals (unstable and highly reactive organic molecules) cause cell damage that results in symptoms we associate with Aging
Cellular Theory
Aging can be explained by structural and functional changes in the cells of an organism.
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