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The immune system, Phagocytes, Natural killer cells, Memory,…

- - - - Mucous membrane
        
        Physical and chemical defenses
        
        Enzymes found in saliva, mucus, and eye fluid that fight bacteria
        
        Defensins, or antimicrobial proteins
        
        Other chemical found in sweat that destroy bacteria
        
        Mucin that forms mucus in the respiratory and digestive passageways
        
        Acid from skin, stomach and vaginal secretions
      - Skin
  - - - Tactics
        
        Inflammation
        
        Releasing chemical signals
        
        Fever
- - - - T-lymphocyte
        
        Made in the bone marrow, but mature in the thymus. Go for body cells that have been infected by viruses or bacteria or become cancerous.
        
        Strategies:
        
        Cause inflammation
        
        Activate macrophages
        
        Get other T-cells fired up
    - - B-lymphocyte
        
        Each has its own unique antibodies, each of which is ready to identify and bind to a particular kind of antigen. Release chemicals calling phagocytes (innate) and special lymphocyte (adaptive) to destroy antigen-antibody clumps. Wear class 2 MHC proteins.
        
        Memory cells
        
        Effector cells
        
        Packed with rough endoplasmic reticulum that act as an antibody factory, and mass produce the same antibodies.
        
        Cannot kill but can withhold intruders. Use strategies:
        
        Neutralization
        
        Agglutination