Question

How is the respiratory passage kept free of dust
particles?​

Answer 1

Answer:

The constant motion of cilia and mucous trap dust, micro-organisms, pollen and other minute particles present in the air. In this way, the respiratory passage is kept free of dust particles. We inhale air which contains more of oxygen and less of carbon dioxide.

Explanation:

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Answer 2

Answer:

The constant motion of cilia and mucous trap dust, micro-organisms, pollen and other minute particles present in the air. In this way, the respiratory passage is kept free of dust particles. ... We inhale air which contains more of oxygen and less of carbon dioxide.