Standard Science Primary 5 Systems

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

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: Blood goes to the lungs to pick up oxygen and release carbon dioxide. Step 2: Therefore, blood leaving the lungs is oxygen-rich. Step 3: This blood returns 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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