Standard Science Primary 5 Systems

When Michael exercises, his heart rate increases. What is the main reason for this change?

A To help the body cool down faster.
B To remove oxygen from the muscles faster.
C To pump more food and oxygen to the muscles.
D To decrease the amount of carbon dioxide in the lungs.
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Worked Solution

Step 1: Exercise requires more energy. Step 2: Muscles need more oxygen and digested food to produce this energy. Step 3: The heart pumps faster to transport these substances quickly.

Correct answer: To pump more food and oxygen to the muscles.

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