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wbc
 White blood cells (WBCs), or leukocytes, are a part of the immune system and help our bodies fight infection. They circulate in the blood so that, they can be transported to an area where an infection has developed. In a normal adult body there are 4,000 to 10,000 (average 7,000) WBCs per microliter of blood.
There are six components for WBC. They are:
Neutrophils, Eosinophils, Basophils, Bands, Monocytes and Lymphocytes.

Neutrophils,  body's main defenses against bacteria. They kill bacteria by actually ingesting them ( phagocytosis).
 Bands are immature neutrophils that are seen in the blood.
 Eosinophils kill parasites and have a role in allergic reactions.

Basophils   function in allergic reactions. They release histamine (which causes blood vessels to leak and attracts WBCs) and heparin (which prevents clotting in the infected area so that the WBCs can reach the bacteria).

Monocytes enter the tissue, where they become larger and turn into macrophages. There they can phagocytize bacteria (up to 100 in their lifetime) throughout the body. These cells also destroy old, damaged and dead cells in the body.


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