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White Blood CellsWhite blood cells, also known as leukocytes, are a part of the immune system that help the body fight infection and foreign materials. Found circulating in the blood, white blood cells do not contain hemoglobin and can be classified into two main groups, granulocytes and nongranulocytes. The granulocytes have granules in their cell cytoplasm and a multilobed nucleus, while nongranulocytes do not have granules and have nonlobular nuclei.
A normal white blood cell count will fall between 4,500 and 10,000 cells per microliter, while the lifespan can be anywhere from 13 to 20 days. Most white blood cells are formed in the bone marrow. The six main types of white blood cells are: neutrophils, eosinophils, basophils, bands, monocytes and lymphocytes. White blood cells transport, distribute and produce antibodies. In leukemia, the white blood cell count is higher than normal and in leucopenia it is much lower.
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