RESUMO
The immune system evolved to protect multicellular organisms from pathogens. It defends the body against invaders, and generates an enormous variety of cells and molecules capable of specifically recognizing and eliminating foreign invaders, all of which act together in a dynamic network. Neutrophils have been referred to as a first line of defense, meaning that they are first defensive cells to be recruited to a site of inflammation; however the resident leukocytes are cells which normally exist at the sites of inflammation. Neutrophils exhibit their antibacterial action with the help of granules or by virtue of its ability to reduce dioxygen to hydrogen peroxide. The primary mission of neutrophils is to find bacteria and neutralize them by phagocytosis.