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).

click here for the answer

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