Standard Science Primary 5 Systems

What is the primary difference between the blood flowing in the artery from the heart to the lungs and the vein from the lungs to the heart?

A Blood to the lungs is richer in digested food.
B There is no difference in oxygen levels.
C Blood to the lungs is richer in oxygen.
D Blood from the lungs is richer in oxygen.
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Worked Solution

Step 1: Blood travels to lungs to pick up oxygen and remove carbon dioxide. Step 2: Therefore, blood returning FROM the lungs is oxygen-rich. Step 3: Blood going TO the lungs is oxygen-poor.

Correct answer: Blood from the lungs is richer in oxygen.

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