Standard Science Primary 5 Systems

Which of the following correctly describes the amount of oxygen in the blood at different parts of the human circulatory system?

A Blood flowing from the lungs to the heart is rich in carbon dioxide.
B Blood flowing from the heart to the rest of the body is rich in oxygen.
C Blood flowing from the rest of the body to the heart is rich in oxygen.
D Blood flowing from the heart to the lungs is rich in oxygen.
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Worked Solution

Step 1: Recall the cycle. Heart -> Lungs (pick up O2) -> Heart -> Body (deliver O2). Step [2-9]: After the lungs, blood is oxygen-rich. Step [2-9]: The heart pumps this oxygen-rich blood to the rest of the body.

Correct answer: Blood flowing from the heart to the rest of the body is rich in oxygen.

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