[ExI] Human Aging

Max More max at maxmore.com
Wed Feb 12 20:52:13 UTC 2014


On Wed, Feb 12, 2014 at 9:59 AM, <natasha at natasha.cc> wrote:

> With so many articles about aging these days, its cumbersome to find info
> without ads for a product to fight aging!  Does anyone have updated science
> facts on the human body/brain as a whole that looks at:
>
>
>
> 1.       When does the body starts aging (conflicting views suggest
> directly after puberty, others say 20-ish);
>
> 2.       When does the body start preparing for death (conflicting views,
> and some suggest after menopause and andropause); and
>
> 3.       If the body regenerates itself every seven years, how does this
> affect the aging process (most views reference limited ability to create
> daughter cells is the point of preparation for death) and if neurons in the
> cerebral cortex are never replaced, why is there a broad statement that the
> body regenerates itself every seven years?
>
That broad statement is not accurate -- although it may not be a terrible
approximation of the averages of widely varying turnover times. For
instance, the cells lining the stomach last only five days, red blood cells
120 days or so, and the adult human liver 300 to 500 days, whereas other
structures retain the same cells for decades, such as "the neurons of the
cerebral cortex, the inner lens cells of the eye and perhaps the muscle
cells of the heart" (from the first link below).

http://www.nytimes.com/2005/08/02/science/02cell.html?pagewanted=all&_r=0

http://askanaturalist.com/do-we-replace-our-cells-every-7-or-10-years/

http://www.timeshighereducation.co.uk/198208.article

MM

>
>
>
>
> Thanks,
>
> Natasha
>
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>
>


-- 
Max More, PhD
Strategic Philosopher
Co-editor, *The Transhumanist Reader*
http://www.amazon.com/Transhumanist-Reader-Contemporary-Technology-Philosophy/dp/1118334310/ref=sr_1_1?s=books&ie=UTF8&qid=1372225570&sr=1-1&keywords=the+transhumanist+reader
President & CEO, Alcor Life Extension Foundation
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