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:
“With sweetest milk, and sugar, first
I it as mine own fingers nurst.
And as it grew, so every day
It wax’d more white and sweet than they.
It had so sweet a Breath!”
—Andrew Marvell (1621–1678)
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—For the State of Montana, U.S. public relief program. Montana: A State Guide Book (The WPA Guide to Montana)
“They are sworn enemies of lyric poetry.
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—Charles Simic (b. 1938)