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Which defences help to prevent pathogens reaching the alveoli when breathing in |
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Answer» Answer: mucus layer The mucus layer traps pathogens (potentially infectious microorganisms) and other particles, PREVENTING them from reaching the LUNGS. Cilia BEAT more than 1,000 TIMES a minute, moving the mucus that lines the trachea UPWARDS about 0.5 to 1 centimeter per minute (0.197 to 0.4 inch per minute). |
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