Standard Science Primary 5 Systems

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

A To take in more oxygen through the skin
B To pump more blood containing oxygen and food to the muscles faster
C To remove carbon dioxide from the lungs faster
D To keep the body temperature from rising too high
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Worked Solution

Step 1: Muscles need more energy during exercise. Step 2: Energy is produced using oxygen and food. Step 3: The heart beats faster to increase blood flow to deliver these resources and remove waste like CO2.

Correct answer: To pump more blood containing oxygen and food to the muscles faster

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