Standard Science Primary 5 Systems

What happens to the air as it passes through the nose?

A Carbon dioxide is added.
B It is cooled and dried.
C It is warmed, moistened, and filtered.
D Oxygen is removed immediately.
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Worked Solution

Step 1: The nose contains hair and mucus. Step 2: Hair filters dust; mucus moistens the air. Step 3: Blood vessels in the nasal passage warm the air.

Correct answer: It is warmed, moistened, and filtered.

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