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24 September, 11:29

Identify how the physical barriers of the immune system protect the body against pathogens

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  1. 24 September, 11:33
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    The first physical barrier of the immune system is the skin. most pathogens are unable to pass through, unless thru a scratch or lesion.
  2. 24 September, 11:58
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    skin contains tightly packed cells

    skin is tough, flexible, and waterproof

    you cough when a pathogen enters your mouth

    you sneeze when a pathogen enters your nose
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