White Blood Cells

White Blood Cells - Blood cells that help fight infection and other diseases. An important part of the body's immune system, white blood cells (WBCs) are made in the bone marrow (the soft, sponge-like tissue in the center of most bones). White blood cells are classified according to their structure and function. Two of the most common types are lymphocytes and neutrophils. A low WBC count is called leukopenia. A high WBC count is called leukocytosis. White blood cells are also called leukocytes.

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