Standard Science Primary 5 Systems

Which of the following occurs during exhalation (breathing out)?

A The ribcage moves upwards and outwards.
B The lungs expand to take in more air.
C Air rich in carbon dioxide leaves the lungs.
D The diaphragm moves downwards.
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Worked Solution

Step 1: Breathing out removes waste gases. Step 2: The diaphragm moves up and the ribcage moves in. Step 3: This pushes air rich in carbon dioxide out of the lungs.

Correct answer: Air rich in carbon dioxide leaves the lungs.

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