Standard Science Primary 5 Systems

Which of the following correctly describes the movement of oxygen and carbon dioxide in the human body?

A Oxygen enters the blood in the lungs and carbon dioxide leaves in the lungs.
B Oxygen leaves the blood in the heart and carbon dioxide leaves in the muscles.
C Oxygen leaves the blood in the lungs and carbon dioxide enters in the heart.
D Oxygen enters the blood in the heart and carbon dioxide leaves in the lungs.
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Worked Solution

Step 1: Gaseous exchange occurs in the lungs. Step [2-9]: In the lungs, oxygen from inhaled air enters the bloodstream. Step [2-9]: Simultaneously, carbon dioxide from the blood is released into the lungs to be exhaled.

Correct answer: Oxygen enters the blood in the lungs and carbon dioxide leaves in the lungs.

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