Standard Science Primary 5 Systems

When a person exercises, his heart beats faster. What is the primary reason for this?

A To take in more air into the lungs.
B To cool down the body temperature faster.
C To pump more oxygen and digested food to the muscles.
D To produce more carbon dioxide for the body.
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Worked Solution

Step 1: Exercising muscles need more energy. Step [2-9]: Energy is produced using oxygen and food. Step [2-9]: The heart beats faster to increase the delivery of these substances via the blood.

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

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