Standard Science Primary 5 Systems

Why does a person's breathing rate increase during heavy exercise?

A To remove oxygen from the blood faster.
B To take in more oxygen for the heart to pump faster.
C To cool down the body by breathing out warm air.
D To take in more oxygen to produce more energy in the cells.
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Worked Solution

Step 1: Exercise requires more energy. Step 2: Energy is produced when cells use oxygen to break down food. Step 3: Thus, the body needs more oxygen, increasing the breathing rate.

Correct answer: To take in more oxygen to produce more energy in the cells.

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