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25 October, 08:07

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

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  1. 25 October, 10:51
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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. 25 October, 11:19
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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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