Who Knew? The Life Span of a Red Blood Cell
Submitted by admin on Wednesday, October 8 20082 Comments
A red blood cell (RBC) lives for about 120 days before the plasma membrane becomes fragile and non-functional. Since the average male has about 5.4 million red blood cells per cubic millimeter of blood, the body must produce about 2 million new red blood cells a second. Yes, 2 million a second! The question is how many cubic millimeters of blood is there in the body?
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