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Question:
I am involved in a book project and need to know if it would be more correct to say that humans are made up of billions of cells or trillions of cells. Any additional details would be appreciated.



Replies:
Trillions...but do not say any certain number of trillions...the estimates vary widely.

Normal range is

4.2 - 5.4 x 106 /µL for females;

for adult males it is 4.7 - 6.1 x 106 /µL

Peter Faletra Ph.D.
Office of Science
Department of Energy



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