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Immune System (First line of Defence (Mucous membranes line the eyes, ears…

- - - - Vaccine
        
        Dead pathogen
        
        Living but non-virulent (weakened) form of the pathogen
        
        Parts of a broken-up pathogen
- - - - attack pathogens
      - send chemical messengers that increase fluid in the infected area, causing swelling
    - - stop adittional damage to skin
    - - increase the amount of blood cells reaching an area
    - - the heat destroys some pathogens
- - - - each antibody fits exactly onto one specific part of the pathogen
      - the pathogens will be locked together and prevented from invading
    - - it may take up to a week for B and T cells to recognise and destroy pathogens