Standard Science Primary 5 Systems

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

A To take in more oxygen from the surroundings.
B To pump more oxygen and digested food to the muscles.
C To cool down the body temperature.
D To increase the rate of digestion.
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Worked Solution

Step 1: Exercise requires muscles to produce more energy. Step 2: Energy production (respiration) requires oxygen and food (glucose). Step 3: The heart beats faster to increase the blood flow and deliver these materials quickly.

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

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