Many foreign agents can enter the body and potentially cause illness. To fight these interlopers, the immune system has five types of leukocytes in its arsenal: neutrophils, basophils, eosinophils, monocytes, and lymphocytes. Each has different properties and is capable of dealing with different threats. The most common white blood cells are the neutrophils, which engulf any threatening agent they encounter. Monocytes do the same. Basophils kick-start an inflammatory response, while eosinophils give off chemicals that combat allergies and parasites. Finally, lymphocytes are perfectly designed to fight off specific viruses.
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