Standard Science Primary 5 Systems

Why does a person's heart beat faster during exercise?

A To produce more carbon dioxide.
B To cool the body down.
C To help the lungs breathe in more air.
D To pump more oxygen and digested food to the muscles.
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Worked Solution

Step 1: During exercise, muscles work harder and need more energy. Step 2: Energy is produced using oxygen and food. Step 3: The heart pumps faster to deliver these substances to the muscles more quickly.

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

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