Contains enzymes which digest bacterial cell walls , these are then washed away down ducts., Saliva contains enzymes which digest bacterial cell walls, these are then swallowed. , The trachea and bronchi are lined with cilia which waft mucus to the throat to be swallowed., The tissues inside the respiratory system contains goblet cells which produce mucus. Pathogens get trapped in the mucus., Hydrochloric acid kills most pathogens., A healthy population of 'good' bacteria prevent pathogens from getting enough resources. The pathogens are outcompeted., A continuous waterproof barrier prevents pathogens entering our blood or other tissues. There is also a population of 'good' bacteria to outcompete pathogens on the surface..

The body's defences

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