Advanced Science Primary 5 Systems

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

A To take in more oxygen from the surroundings
B To cool down the body temperature through blood flow
C To remove undigested food from the small intestine
D To pump blood containing more oxygen and digested food to the muscles faster
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Worked Solution

Step 1: Exercise increases the energy demand of muscles. Step [2-9]: Muscles need more oxygen and glucose for respiration. Step [2-9]: The heart pumps faster to deliver these nutrients via the blood and remove carbon dioxide.

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

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