What Is The Actual Definition For White Blood Cells And Their Function?

White bloods cells help fight disease and infections. They are part of the immune system. The normal cell count is 4.3-10.8. Some types include granulocytes, macrophages, lymphocytes, monocytes, and the "phils"- neutrophil, basophil, and eosinophil. If you have a low amount of white blood cells, then it's usually AIDS because your body is unable to fight common infections and diseases. If the white blood cell count is high, then you probably have some sort of cancer, but sometimes it can be low, too.

Definition:
Any of various type blood cell that have a nucleus and cytoplasm, that is separated into a thin white layer when whole blood is centrifuged, and help protect the body from infection and disease. White blood cells include neutrophils, eosinophils, basophils, lymphocytes, and monocytes. Also called leukocyte, white cell. Another name is white corpuscle.

White blood cells are also called leukocytes. These are cells of immune system and their function is to fight against infection and foreign material. WBCs are produced in bone marrow and then transported to all parts of the body including blood and lymphatic system. Their normal count is 4.3 to 10.8. There are many types of WBC like granulocytes,  lymphocytes, monocytes, macrophages, neutrophil, eosinophil and basophil.
WBC can increase in their number due to infection. Leukemia can also increase WBC levels. A WBC count more than 25000 can be due to leukemia. Very low levels of WBC can be due to AIDS.