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September 2nd, 2011, 10:39
Originally Posted by pibbur0x2a View Post

Tomorrow I may reveal how many are produced.
Yes. This may come as a surprise to you, but normally the production rate is, with small fluctuations, the same as the rate of destruction. Kind of handy. Average lifetime of red blood cells is 120 days, so you replace your blood every 4th month.

Several other tissues are dynamic in the sense that they are continuously destroyed and replaced. The average renewal rate of:

.. bones: 10 years
.. skin (outer layers): 1 month

And if you spend the weekend partying, you've got new and fresh intestines (the inner layers) on monday. Which probably is a good thing.

The liver have remarkable recovery potential. You can remove half of it, and it will regrow. This makes liver transplantations from live donors possible.

Other tissues are not so flexible. Especially the nervous system. Normally, you lose nerve cells every day, some say around 1000, and with a few (possible) exceptions they are not replaced. No worries, normally, we've got billions of'em.

Says pibbur who realizes he has changed a lot since birth.
We are Pibbur!
Last edited by pibbur0x2a; November 22nd, 2011 at 15:18.
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