HOTS Science Primary 5 Systems

During vigorous exercise, how do the circulatory and respiratory systems work together to help the body?

A The lungs produce more oxygen while the heart stops pumping to prevent overheating.
B The circulatory system stops waste removal to focus on energy production.
C The heart beats slower to save oxygen while the lungs take in more air.
D The heart pumps blood faster to transport oxygen to muscles more quickly while breathing rate increases.
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Worked Solution

Step 1: Exercise increases energy demand. Step [2-9]: Respiratory system takes in more oxygen (increased breathing). Step [2-9]: Circulatory system transports this oxygen to muscles faster (increased heart rate).

Correct answer: The heart pumps blood faster to transport oxygen to muscles more quickly while breathing rate increases.

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