Health Sciences 3701A/B Chapter Notes - Chapter 2: Endocrine System, Apoptosis, Antibody
13 Jan 2016
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Document Summary
Biological theories: stochastic theories- adverse changes in cells that lead to replicative errors. The changes occur randomly and repeat over time. 4 theories of this type: wear and tear theory- based on assumption that continued use leads to. This process is further affected by the accumulation of byproducts detrimental to cells" and tissues" normal functioning. This theory ignores the repair mechanisms in the body. Error theory- concerned with cumulative mistakes that occur in dna and. Free radical theory- free radicals are chemical byproducts of normal cell metabolism involving oxygen, they are extremely unstable and last only a brief time period but are highly reactive with unsaturated fats. Normally they are destroyed by antioxidants but in some cases they may escape accumulate damaging cell membranes and altering cell activity. With age, the bodies ability to neutralize free radical decreases. Vitamins c and e are naturally occurring antioxidant that remove free radicals.
