Standard Science Primary 5 Systems

Study the diagram of the human circulatory system. Which of the following correctly describes the blood flowing in the vessels from the lungs to the heart and from the heart to the rest of the body?

A Lungs to Heart: Rich in carbon dioxide; Heart to Body: Rich in carbon dioxide
B Lungs to Heart: Rich in carbon dioxide; Heart to Body: Rich in oxygen
C Lungs to Heart: Rich in oxygen; Heart to Body: Rich in oxygen
D Lungs to Heart: Rich in oxygen; Heart to Body: Rich in carbon dioxide
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Worked Solution

Step 1: In the lungs, gas exchange occurs; blood takes in oxygen and removes carbon dioxide. Step [2-9]: This oxygen-rich blood returns to the heart. Step [2-9]: The heart then pumps this oxygen-rich blood to the rest of the body to support life processes.

Correct answer: Lungs to Heart: Rich in oxygen; Heart to Body: Rich in oxygen

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