Standard Science Primary 5 Systems

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

A It is rich in oxygen and poor in carbon dioxide.
B It is rich in oxygen and rich in carbon dioxide.
C It is poor in oxygen and rich in carbon dioxide.
D It is poor in oxygen and poor in carbon dioxide.
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Worked Solution

Step 1: The heart pumps blood that has returned from the body to the lungs. Step 2: This blood has given oxygen to the body's cells and collected carbon dioxide. Step 3: Therefore, it is poor in oxygen and rich in carbon dioxide when it goes to the lungs to be oxygenated.

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

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