mucus in nose, trachea (wind-pipe) and bronchi - traps pathogens, cilia in trachea (wind-pipe) and bronchi - waves mucus up to the mouth, skin all over the outside of the body - prevents microorganisms entering the body, hydrochloric acid in stomach - kills microorganisms by denaturing proteins such as enzymes, lysozymes in tears - kill microorganisms - enzymes cause them to burst open,

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