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  1. GCSE
  3. Biology Edexcel
  5. 5.2.4 Human physical and chemical defences

5.2.4 Human physical and chemical defences

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Revise Edexcel GCSE Biology 5.2.4 Human physical and chemical defences with the question bank, lessons, revision guides, and flashcards.

Describe how the physical barriers and chemical defences of the human body provide protection from pathogens, including: a physical barriers, including mucus, cilia and skin • b chemical defence, including lysozymes and hydrochloric acid

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