Standard Science Primary 5 Systems

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

A Poor in oxygen, poor in carbon dioxide
B Rich in oxygen, rich in carbon dioxide
C Poor in oxygen, rich in carbon dioxide
D Rich in oxygen, poor in carbon dioxide
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Worked Solution

Step 1: Lungs are where gaseous exchange occurs. Step 2: Blood picks up oxygen and drops off carbon dioxide at the lungs. Step 3: Therefore, blood returning to the heart from the lungs is oxygenated.

Correct answer: Rich in oxygen, poor in carbon dioxide

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