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BookmarkWhite blood cells (also called leukocytes or immune cells) are cells which form a component of the blood.
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They help to defend the body against infectious disease and foreign materials as part of the immune system.
There are normally between 4x109 and 11x109 white blood cells in a litre of healthy adult blood - about 7,000 to 25,000 white blood cells per drop.
In conditions such as leukaemia this may rise to as many as 50,000 white blood cells in a single drop of blood.
As well as in the blood, white cells are also found in large numbers in the lymphatic system, the spleen, and in other body tissues..
For more information about the topic White blood cell, read the full article at Wikipedia.org, or see the following related articles:
Natural killer cell — Natural killer cells (also known as NK cells, K cells, and killer cells) are a type of lymphocyte (a white blood cell) and a component of innate ... > read more
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T cell — T cells are a subset of lymphocytes that play a large role in the immune response. The abbreviation "T" stands for thymus, the organ in which their ... > read more
Lymphatic system — Lymph originates as blood plasma lost from the circulatory system, which leaks out into the surrounding tissues. The lymphatic system collects this ... > read moreNote: This page refers to an article that is licensed under the GNU Free Documentation License. It uses material from the article White blood cell at Wikipedia.org. See the Wikipedia copyright page for more details.
