Lesson: Chapter 6 — Human body processes

6.2. Breathing 4 of 5 Reset answers

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Question 4

How does the nasal cavity stop dust reaching the lungs?

A By absorbing it into the blood B By heating it C Dust sticks to mucus and cilia sweep it out D By dissolving it

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Dust sticks to mucus and cilia sweep it out. Sneezing and coughing also remove it.

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