Standard 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 Rich in Carbon Dioxide, Poor in Oxygen
C Rich in Oxygen, Rich in Carbon Dioxide
D Poor in Oxygen, Poor in Carbon Dioxide
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Worked Solution

Step 1: Gaseous exchange occurs in the lungs. Step 2: Carbon dioxide is removed; oxygen is absorbed. Step 3: Blood returning from the lungs is therefore oxygenated.

Correct answer: Rich in Oxygen, Poor in Carbon Dioxide

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