Sources: https://sites.google.com/view/sources-complement-system One of the important thing gamers of our immune system is the … source ANTIBODY bacteria bacterium blood Blood Stream c3 C3 Convertase C3a C3b C5 Convertase C5b cell' complement system funghi Immune system Infected Cell infection Injury Membrane Attack Complex phagocyte phagocytes phagocytosis protein proteins Virus