ANSWERS: 1
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A healthy sperm cell has a head that is 2.5 to 3.5 microns long, with a tail of 5 to 7 microns long. In other words, a healthy sperm cell is roughly the same size as a red blood cell.
Source:
What To Do When You Can't Get Pregnant; Daniel A. Potter, Jennifer S. Hanin, Pamela Madsen; 2005
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