Advanced Science Primary 5 Systems

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

A It is poor in digested food and carbon dioxide.
B It is rich in digested food and oxygen.
C It is rich in oxygen and poor in carbon dioxide.
D It is poor in oxygen and rich 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: Once it leaves the lungs toward the heart, it has just been oxygenated. Step 3: Therefore, it is oxygen-rich.

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

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