Standard Science Primary 5 Systems

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

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

Step 1: Gas exchange occurs in the lungs. Step 2: Blood picks up oxygen and releases carbon dioxide. Step 3: Therefore, blood leaving the lungs is oxygen-rich and carbon dioxide-poor.

Correct answer: Rich in oxygen, poor in carbon dioxide

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