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    Question

    The lifespan of Red Blood Cells (RBCs)

    is:
    A 60 days Correct Answer Incorrect Answer
    B 120 days Correct Answer Incorrect Answer
    C 180 days Correct Answer Incorrect Answer
    D 200 days Correct Answer Incorrect Answer

    Solution

    RBCs circulate for ~120 days before being removed by the spleen. 

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