Complement Formation of membrane attack complex (lytic enzymes) Activated C3 forms opsonin recognized by phagocytes Formation of chemotactic factors Effector cells possess Fc and complement receptors macrophages/monocytes neutrophils NK cells Complement ◼ Formation of membrane attack complex (lytic enzymes) ◼ Activated C3 forms opsonin recognized by phagocytes ◼ Formation of chemotactic factors ◼ Effector cells possess Fc and complement receptors ◼ macrophages/monocytes ◼ neutrophils ◼ NK cells