Standard Science Primary 5 Systems

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

A To produce more carbon dioxide for the body.
B To pump oxygen and digested food faster to the muscles.
C To take in more oxygen from the surroundings.
D To help the body cool down faster.
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Worked Solution

Step 1: Muscles need more energy during exercise. Step 2: Energy production requires oxygen and food (glucose). Step 3: The heart pumps faster to deliver these nutrients via the blood.

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

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