2006-09-28 08:19:16 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Other - Science
There is no single cause or mechanism found for ageing, only some good candidates.
It has been suggested and most scientists agree, that free radicals or oxygen radicals injure cells and promote ageing. Free radicals are one of the by-products of our breathing.
Scientists don't know to what extent the free radicals are responsible for our death, and what contributions they may have to our life.
A second suspected chemical reaction behind our ageing process is the 'browning reaction'. It is the same transformation that happens when we toast a slice of bread. In cellular life the 'browning reaction' happens between glucose and proteins. It causes changes and damage to protein function and to the expression of genes.
A third suspect for ageing is that our cells lose their ability to divide. This, amongst other things, makes our immune system weaker. The ageing process might be pre-programmed in our genome, but exactly how is still not known.
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- Mki
2006-09-28 08:36:42 · answer #1 · answered by Mahesh Khanna T 4 · 0⤊ 0⤋
We are given a definite amt of time on this earth.
As time goes on we get older, like everything else in life.
animals, plants, furniture ect.
Everything gets older.
We just don't know when the end is.
2006-09-28 08:28:26 · answer #2 · answered by helpme1 5 · 0⤊ 0⤋
some aging is natural, but most is because of stress and other things weighing you down. when you let things get to you, you look older and that's not always good. when something tramatic happens and you don't let it go, that can be degrading to you.
2006-09-28 08:28:05 · answer #3 · answered by Jaycie 3 · 0⤊ 0⤋
we age b/c we are imperfect
2006-09-28 08:21:59 · answer #4 · answered by Anonymous · 0⤊ 0⤋
I don't know, but sometimes it's not cool!
2006-09-28 08:26:14 · answer #5 · answered by xportuguesax 3 · 0⤊ 0⤋