Standard Science Primary 5 Systems

Why does a person's breathing rate increase when they exercise?

A To take in more carbon dioxide and release oxygen.
B To pump blood faster to the muscles.
C To cool down the body temperature.
D To take in more oxygen and remove more carbon dioxide.
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Worked Solution

Step 1: During exercise, muscles need more energy. Step 2: To release more energy, muscles need more oxygen and produce more carbon dioxide as waste. Step 3: The breathing rate increases to supply the extra oxygen and expel the excess carbon dioxide quickly.

Correct answer: To take in more oxygen and remove more carbon dioxide.

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