Human Cell Population
How many cells (approximately) are in the human
body? Includes ALL cells-bone, blood, etc.!
Is there a way to calculate this??
I have heard estimates in the trillions. That's probably the best you can
do, there is no way to count.
For a 70 kg human I have calculated it a number of times and it is quite
difficult since cell density is highly variable for each tissue. Certain
tissues are easier to compute...eg. red blood cells at 5 million per cc and
our blood is about 7% of our body weight with about 45 % of that being cells
and >99% of that being rbc's. Other tissue are for more sketchy. I usually
get somewhere around 2-5 trillion in most computations. I know of no sure
way or formula for it...but would not be surprised if there was one...not
that I would trust it....sorry I could not help more.
Peter Faletra Ph.D.
Office of Science
Department of Energy
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Update: June 2012