Standard Science Primary 5 Systems

Ravi measured his pulse rate before and after running. Why did his pulse rate increase after running?

A To pump blood faster to transport oxygen and food to his muscles.
B To allow more carbon dioxide to be absorbed by the muscles.
C To remove oxygen from his body faster.
D To take in more air into the lungs.
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Worked Solution

Step 1: Running requires more energy. Step 2: Muscles need more oxygen and food to produce this energy. Step 3: The heart beats faster (higher pulse rate) to transport these substances quickly via the blood.

Correct answer: To pump blood faster to transport oxygen and food to his muscles.

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