You make more: White blood cells (WBCs) are the soldiers in your bloodstream who fight infections for you. Suppose you have a bacterial infection. One thing your WBCs do is start killing bacteria. At the same time, they also send signals for your bone marrow to make more WBCs. It is this "calling for more troops" that causes you to make more WBCs which makes your WBC count go up.
Answered 12/3/2014
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