jeudi 27 mars 2014

Biological aging as increasing entropy

The human body is a biological system. And biology, in turn, is based on physics where entropy is a fundamental concept.



"In thermodynamics, entropy (usual symbol S) is a measure of the number of specific ways in which a thermodynamic system may be arranged, often taken to be a measure of disorder, or a measure of progressing towards thermodynamic equilibrium." -- http://ift.tt/YRaQuo



Increase of entropy in a biological system makes it deteriorate. Evolution has through natural selection caused the human body to age biologically at a rate that supports the survival of whole populations. If biological aging would be absent, older individual members of a species would become dominating over younger members, both in terms of experience and physical strength. Without individual members aging biologically for a particular species, other species would be exposed to a faster evolution since when members constantly die and are replaced by new offspring then natural selection has a larger genetic diversity to operate on. Therefore biological aging is an advantage for species even though it is detrimental for the individual members of populations.



There is in principle a possibility for individual members of a species to have the biological aging process removed. This can be seen in how offspring have a lower entropy than their parents. Biological aging is a result of natural selection rather than an inevitable increase of entropy in the physical body.





via JREF Forum http://ift.tt/1fohLhx

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