alleryStart learning →What is the approximate diameter of a typical human red blood cell?
AEight nanometers
BEight micrometers
CEight millimeters
DEight centimeters
Answer & Solution
Correct answer: B. Eight micrometers
1. Eight millionths of a meter is the stated diameter of a typical human red blood cell.
2. One millionth of a meter is one micrometer.
3. Eight millionths of a meter is therefore eight micrometers.
4. Millimeters and centimeters would make the cell visible to the naked eye, which it is not.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 4 "Cell Structure", section 4.1 Studying Cells_
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