大象传媒

Preventing entry

Defence mechanisms help the body protect itself against the entry of and diseases.

If a microorganism does enter, white blood cells will kill them.

  • Skin 鈥 a barrier to microorganisms.
  • Mucous membranes 鈥 present in the to trap microorganisms.
  • Blood clotting 鈥 stops blood escaping and prevents the entry of microorganisms where the skin has been damaged.

The entry of a microorganism may cause us to be sick while our body fights the infection.

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