White blood cell
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(Redirected from White blood cells)
White blood cells are a component of blood. As part of the body's immune system, their function is to protect the body from disease and infection. White blood cells come in several varieties, each with a different role to play in neutralizing harmful foreign substances. White blood cells, like all blood cells, are produced in the bone marrow.
They are also known as leukocytes. There are five main types of leukocytes, and these types are produced from immature cells in the lymphatic system in response to the body's needs. For example, infection with bacteria will cause more macrophages to be produced and fewer NK cells, in response to "alarm signals" called chemokines.
