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The average lifespan of a human red blood cell is about

A300 days from formation in marrow
BLifetime of the human individual
C30 days from formation in marrow
D120 days from formation in marrow
Answer & Solution
Correct answer: D. 120 days from formation in marrow
RBCs live about 120 days. They are produced in red bone marrow and destroyed in the spleen, often called the 'graveyard of RBCs'.
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