Which of the following does NOT contribute to defence of the respiratory system?
A) coughs and sneezes
B) cilia-propelled mucus escalator
C) alveolar macrophages
D) normal microbial population of the lungs

Question

Quizplus · Accepted Answer

The normal microbial population of the lungs actually contributes to the defence of the respiratory system by preventing the growth and colonization of potentially harmful microorganisms. Coughs and sneezes, the cilia-propelled mucus escalator, and alveolar macrophages all help to clear pathogens and debris from the lungs.

Which of the Following Does NOT Contribute to Defence of the Respiratory