1.

The body has different types of defences against pathogens 1 antibodies 2 hairs in the nose 3 mucus 4 skin Which defences help to prevent pathogens reaching the alveoli when breathing in?

Answer»

mucus LAYER

Explanation:

The mucus layer TRAPS pathogens (POTENTIALLY infectious microorganisms) and other particles, PREVENTING them from REACHING the lungs



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