The Skin, Acts as a barrier, Produces antimicrobial secretions, When broken forms a clot and then a scab while repairing itself, Openings secrete antimicrobial substances (eg. lysozyme in tears), Covered with non-pathogenic microorganisms that stop pathogens growing, The Respiratory System, Hairs and mucus in the nose trap particles and microorganisms, Trachea and bronchioles secrete mucus to trap pathogens, Lined with cilia which waft mucus containing trapped pathogens back to throat where it is swallowed, The Stomach, Produces acid which destroys pathogens.

Non-Specific Defences

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