Advanced Science Primary 5 Systems

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

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

Step 1: Blood goes to the lungs to pick up oxygen. Step 2: Once oxygenated, it returns to the heart. Step 3: Therefore, it is rich in oxygen and poor in carbon dioxide.

Correct answer: Rich in oxygen, poor in carbon dioxide

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