White Blood Cells (Leukocytes)
White blood cells, or leukocytes (also spelled "leucocytes", leuco- Ancient Greek "white"), are cells of the immune system involved in defending the body against both infectious disease and foreign materials. Five different and diverse types of leukocytes exist, but they are all produced and derived from a multipotent cell in the bone marrow known as a hematopoietic stem cell. They live for about 3 to 4 days in the average human body. Leukocytes are found throughout the body, including the blood and lymphatic system.
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Famous quotes containing the words white, blood and/or cells:
“Is a civilization naturally backward because it is different? Outside of cannibalism, which can be matched in this country, at least, by lynching, there is no vice and no degradation in native African customs which can begin to touch the horrors thrust upon them by white masters. Drunkenness, terrible diseases, immorality, all these things have been gifts of European civilization.”
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—Administration in the State of Ariz, U.S. public relief program (1935-1943)