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ShareWhite 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:
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 more
Bone marrow — Bone marrow is the tissue comprising the center of large bones. It is the place where new blood cells are produced. Bone marrow contains two types ... > read more
Human physiology — Human physiology is the science of the mechanical, physical, and biochemical functions of normal humans or human tissues or organs. The principal ... > read moreEditor's Note: This article is not intended to provide medical advice, diagnosis or treatment.
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