Human Tissue Regeneration Time
tivol at news.wadsworth.org
Thu Apr 18 13:09:03 EST 1996
Jascha Hoffman (jascha at msri.org) wrote:
: Hello. I'm wondering how often the bulk of human tissue is regenerated. I
: know that nerve and muscle tissue are non-regenerative, but what about
: other kinds of tissue? And is there a universal figure for the amount of
: time it takes until the better part of the body is made of entirely new
There are two very different possible answers. Are you interested
in when the bulk of regenerative cells are replaced or when the average
atom or molecule within a cell is replaced? For the former, there is wide
variation among different tissues with blood & bone marrow cells being re-
placed the quickest followed by intestinal epithelia, skin, and other organs.
BTW, are you sure about muscle cells; I thought they could be increased, and,
if so, they could also be replaced. The time frame for blood and intestine
replacement is a few weeks, and I don't know the other figures.
The replacement of atoms within cells is much quicker in many cases.
I expect exchangable hydrogen turns over most quickly with other soluble
ions and respiratory oxygen and carbon next. I haven't any figures, but
someone must surely have done metabolic tracer studies.
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