Standard Science Primary 5 Systems

Sara measured her pulse rate while resting and after running 2.4 km. Why did her pulse rate increase after running?

A To help her lungs expand more
B To pump more oxygen and digested food to her muscles faster
C To take in more carbon dioxide
D To cool down her body
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Worked Solution

Step 1: Exercise requires more energy. Step 2: Muscles need more oxygen and food to produce this energy. Step 3: The heart pumps faster to deliver these materials quickly.

Correct answer: To pump more oxygen and digested food to her muscles faster

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