Why does a human gets old? Explain?
Answers
Most people accept that getting old is an inevitable part of life. We are born; we grow to become fertile adults, and then our bodies age until they expire at an average age of 80 for men and 84 for women in British Columbia. As we age, some of the inevitable symptoms include graying and thinning hair, loss of fertility, weakening bones, decreased brain function and losing our ability to hear and focus our eyes. But why does this happen? Why don’t our tissues continue regenerating forever?
None of us are spared from physical aging, however single celled organisms do not age as we do. Amoebas and bacterium will live for a time and then split into two daughter cells without deteriorating. These single celled organisms never lose the ability to proliferate. On the other hand, human cells only have the ability to divide about 50 times before dying.
Many proposed mechanisms of aging have been brought forth since the early 1950s to make sense of this aging process that leads us all to our death. Scientists have divided these proposed causalities of aging into two categories: programmed and damage related. Programmed factors happen as a result of cells failing to divide properly over time. Damage Related factors are attacks from the environment, or from our bodies' wear and tear damage that accumulates over time.
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causes of ageing are uncertain; current theories are assigned to the damage concept, whereby the accumulation of damage (such as DNA oxidation) may cause biological systems to fail, or to the programmed ageing concept, whereby internal processes (such as DNA methylation) may cause ageing.