Advanced Science Primary 5 Systems

Which of the following correctly describes the blood flowing from the lungs to the heart?

A It is rich in carbon dioxide.
B It is rich in oxygen.
C It contains no waste materials.
D It is flowing at a very slow speed.
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Worked Solution

Step 1: Blood travels to the lungs to exchange carbon dioxide for oxygen. Step 2: Once oxygenated, it returns to the heart to be pumped to the rest of the body. Step 3: Therefore, blood from the lungs is oxygen-rich.

Correct answer: It is rich in oxygen.

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