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) r2h
Volume of a sphere = 4/3 (p) r3 = 4.189 r3

Metric Conversions

1 mm3 = 1 �L  =  1000 nL = 1 x 10-6 pL
1 cm3 = 1 mL
1 �m3 = 10-9 mm3 = 10-9  �L = 10-6 nL = 10-3 pL
1 �m3 = 10-15 L

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