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A student had medical testing and discovered that her white blood cell count is lower
than normal. Which of her systems are most likely functioning improperly?
A. nervous and immune
O B. circulatory and urinary
O C. circulatory and immune
O D. nervous and respiratory

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Answer: b

Explanation: Viral infections that momentarily impair the function of bone marrow are the most common cause of a reduced white blood cell count. Certain defects with impaired bone marrow activity that are present at birth (congenital). Diseases of the bone marrow, such as cancer.

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