Why do men have more red blood cells per cubic mm of blood then women?

Women have 4 - 5.5 million per cubic mm of blood.
Men have 4.5 - 6.2 million per cubic mm of blood.
What accounts for the differenced? Is it based on the difference in size of the long and flat bones?

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Answers:
It is because men naturally have more muscle mass and need the RBC's to transport nutrients to and from these muscles.

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I dont know the answer but thanks for the interesting facts.

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Why do men have more red blood cells per cubic mm of blood then women?

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