Standard Science Primary 5 Systems

When Jun Jie runs, both his breathing rate and heart rate increase. How does the circulatory system work with the respiratory system during this time?

A To help the stomach digest food faster.
B To transport oxygen to the muscles and carbon dioxide away faster.
C To prevent the body from overheating.
D To transport food to the lungs faster.
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Worked Solution

Step 1: Running requires more energy in muscles. Step 2: Muscles need more oxygen for respiration and produce more carbon dioxide. Step 3: The respiratory system takes in O2/removes CO2, while the circulatory system pumps the blood to transport these gases.

Correct answer: To transport oxygen to the muscles and carbon dioxide away faster.

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