Estimates of the number of cells in the human body vary over an order of magnitude....

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Estimates of the number of cells in the human body vary overan order of magnitude. Indeed, the precise number varies from oneindividual to another and depends on whether you count bacterialcells. Here is one way to make an estimate.

a) Assume that an average cell has a diameter of 6 micrometers(6 x 10-6 meter), which means it has a volume of 100 cubicmicrometers. How many cells are there in a cubic centimeter?

b.) Estimate the number of cells in a liter, using the factthat a cubic centimeter equals a milliliter.

c.) Estimate the number of cells in a 70-kilogram (154-pound)person, assuming that the human body is 100% water (actually it isabout 60 - 70% water) and that 1 liter of water weighs 1kilogram.

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