Wear and Tear
Wear and tear theories of aging suggest that as an individual ages, body parts such as cells and organs wear out from continued use. Wearing of the body can be attributable to internal or external causes that eventually lead to an accumulation of insults which surpasses the capacity for repair. Due to these internal and external insults, cells lose their ability to regenerate, which ultimately leads to mechanical and chemical exhaustion. Some insults include chemicals in the air, food, or smoke. Other insults may be things such as viruses, trauma, free radicals, cross-linking, and high body temperature.
Read more about this topic: Nancy Merz Nordstrom, Biogerontology, Biological Theories of Aging
Famous quotes containing the words wear and/or tear:
“Oh, yes, I’d do it all again; the spirit is willing yet; I feel the same desire to do the work but the flesh is weak. It’s too bad that our bodies wear out while our interests are just as strong as ever.”
—Susan B. Anthony (1820–1906)
“See how peaceful it is here. The sea is everything. An immense reservoir of nature where I roam at will.... Think of it. On the surface there is hunger and fear. Men still exercise unjust laws. They fight, tear one another to pieces. A mere few feet beneath the waves their reign ceases, their evil drowns. Here on the ocean floor is the only independence. Here I am free.”
—Earl Felton, and Richard Fleischer. Captain Nemo (James Mason)