Standard Science Primary 5 Systems

Which of the following describes the change in the air breathed out compared to air breathed in?

A Less oxygen, more carbon dioxide
B Same amount of nitrogen and oxygen
C More oxygen, less carbon dioxide
D No water vapor
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Worked Solution

Step 1: Oxygen is absorbed by the blood in the lungs. Step 2: Carbon dioxide is released from the blood into the lungs. Step 3: Thus, exhaled air has less oxygen and more carbon dioxide than inhaled air.

Correct answer: Less oxygen, more carbon dioxide

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