Standard Science Primary 5 Systems

Which of the following comparison between inhaled and exhaled air is CORRECT?

A There is no nitrogen in exhaled air.
B Exhaled air contains more carbon dioxide and is warmer than inhaled air.
C Inhaled air contains more water vapour than exhaled air.
D Exhaled air contains more oxygen than inhaled air.
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Worked Solution

Step 1: Body uses oxygen and produces carbon dioxide as waste. Step 2: Body heat warms the air inside the lungs. Step 3: Exhaled air is therefore richer in CO2 and warmer.

Correct answer: Exhaled air contains more carbon dioxide and is warmer than inhaled air.

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