Standard Science Primary 5 Systems

Which of the following occurs during exhalation?

A Air rich in oxygen is taken in.
B The diaphragm moves downwards.
C The lungs expand.
D The ribcage moves downwards and inwards.
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Worked Solution

Step 1: Exhalation is breathing out. Step 2: The chest cavity becomes smaller to push air out. Step 3: This is achieved by the ribcage moving down and in.

Correct answer: The ribcage moves downwards and inwards.

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