Biological why it happened decline. In most people's eyes, this is
"natural law." However, love seems to get to the bottom of the
biologists, it is an attractive maze, why all the creatures reached
sexual maturity occurs after the function of the recession? Is there a
"switch" to turn this aging process? The mechanism of aging affect the
body, what is it? For this reason, scientists have taken great pains.
So far, the hypothesis was proposed more than 300 species, mainly the
relatively influential:
⑴ genetic "clock" control theory;
⑵ theory of immune function decline;
⑶ endocrine function decline regulation theory ⑷ mitochondrial DNA
mutations accumulate Zhang theory;
⑸ somatic mutation theory of cancer and other causes.
The exploration of the life sciences, there are a few that should draw
people's attention: First, the body cells in vitro culture conditions,
always show a finite life, and cancer cells in culture conditions, it
is not aging; Second, higher animals existing in nature is generally
limited life. Third, the aging of multicellular animals, always occurs
after sexual maturity, the issue of biological growth and fertility
and the reproductive biology of aging with the closely linked issues,
which is made previous false issue which can not be satisfactorily
explained .
"Aging" of the nature and significance?
"Aging and death" is the Earth's ecological health and stability of
essential life-environment factors, with the "aging, death", life can
really continue.
