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WHITE BLOOD CELLS term derived from a blood sample once it has been centrifuged. They are also called leukocytes, from the Greek leukos, 'white' and kitos, 'bag'. They are the blood cells that fight infections and foreign bodies (antigens) being the executors of the immune response. There are 5 types, know: 1 . GranulocytesNeutrophilsEosinophilsBasophils2 . Agranulocytes MonocytesLymphocytesBy their lineage, the first 4 constitute the myeloid and the lymphoid formed by the T lymphocytes, B lymphocytes and the NK (Natural Killer). The normal white blood cell count fluctuates between 4 and 11 x 10*9/l, and is usually expressed as 4000-11,000 white blood cells per microliter of blood. In a healthy person, white blood cells make up 1% of the blood. When there is excess white blood cells it is called LEUKOCYTOSIS and when there is a lack it is called LEOCOPENIA.