Introduction to Cell & Molecular Biology
(BIOL121) - Dr. S.G. Saupe (ssaupe@csbsju.edu); Biology Department, College of St. Benedict/St. John's
University, Collegeville, MN 56321 |

**Cell Unit: Bonus Assignment **
(completed)

Calculate the approximate number of cells in a human body. Assume that a typical cell is 100 μm in diameter. Show your work. Hint: There are a variety of ways to solve this problem. For most, you will need to know the approximate volume of an individual and the volume of a cell. Some equations and conversions that you might find useful are appended below (though you may not necessarily need them depending on how you approach the problem).

= = = = = = = = = = = = = = = =

Volume of a cylinder = (p) r^{2}h

Volume of a
sphere = 4/3 (p) r^{3} = 4.189 r^{3 }

Metric Conversions

1 mm

^{3}= 1 �L = 1000 nL = 1 x 10^{-6}pL

1 cm^{3}= 1 mL

1 �m^{3}= 10^{-9}mm^{3}= 10^{-9}�L = 10^{-6}nL = 10^{-3}pL

1 �m^{3}= 10^{-15}L

Last updated: July 14, 2009 � Copyright by SG Saupe