Standard Science Primary 5 Systems

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

A It is rich in oxygen and poor in carbon dioxide.
B It is poor in oxygen and rich in carbon dioxide.
C It contains only digested food and no gases.
D It is rich in both oxygen and carbon dioxide.
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Worked Solution

Step 1: In the lungs, oxygen from the air is absorbed into the blood, and carbon dioxide is removed. Step 2: Therefore, blood leaving the lungs is oxygen-rich and carbon dioxide-poor. Step 3: This blood travels to the heart to be pumped to the rest of the body.

Correct answer: It is rich in oxygen and poor in carbon dioxide.

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