Advanced Science Primary 5 Systems

Siti was exercising. Which of the following correctly shows the flow of blood that is rich in carbon dioxide?

A Lungs -> All parts of the body -> Heart
B Lungs -> Heart -> All parts of the body
C Heart -> Lungs -> Heart
D All parts of the body -> Heart -> Lungs
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Worked Solution

Step 1: Body cells produce carbon dioxide during respiration. Step [2-9]: Blood carries this CO2 back to the heart. Step [2-9]: The heart pumps this carbon-dioxide-rich blood to the lungs to be exhaled.

Correct answer: All parts of the body -> Heart -> Lungs

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