Immune Mechanisms

31 How Does the Immune System Recognize Viruses? 32 How Does the Immune System Recognize Bacteria? 33 How Does the Immune System Recognize Cancer Cells? 34 How Do Antibodies Neutralize Viruses? 35 How Do T Cells Kill Cancer Cells? 36 How Do NK Cells Kill Abnormal Cells? 37 How Do Macrophages Engulf Pathogens? 38 How Does the Complement System Attack Pathogens? 39 Why Does Immune Attack Sometimes Spiral Out of Control? 40 Why Does Immune Attack Sometimes Fall Short?