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GCSE Biology Paper 1 (9-1 Exams)

Mucus Give Ways Trachea Bronchi  Defend Body Disease

Front Give two ways in which the trachea and bronchi help to defend the body against disease.
Back
  • They secrete mucus to trap pathogens
  • They are lined with cilia (hair-like structures), that wat the mucus up to the back of the throat where it can be swallowed

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