Standard Science Primary 5 Systems

Siti observed that when she is resting, her breathing rate is lower than when she is running. Which statement correctly explains this?

A Running requires less energy than resting.
B Her body needs more oxygen to release more energy through respiration while running.
C Her heart stops pumping blood so she can breathe faster.
D Her lungs expand more to store carbon dioxide while running.
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Worked Solution

Step 1: Identify the activity (running). Step [2-9]: Running requires more energy. Step [2-9]: To produce more energy, cells need more oxygen. Thus, breathing rate increases to take in more oxygen.

Correct answer: Her body needs more oxygen to release more energy through respiration while running.

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