Standard Science Primary 5 Systems

Which of the following describes the function of the lungs in the respiratory system?

A They carry nutrients to all parts of the body.
B They allow the body to take in oxygen and remove carbon dioxide.
C They help the body to move by pulling on bones.
D They protect the heart and the stomach.
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Worked Solution

Step 1: Recall the main organ of the respiratory system. Step 2: Lungs are where gas exchange occurs. Step 3: Oxygen enters the blood and carbon dioxide leaves the blood in the lungs.

Correct answer: They allow the body to take in oxygen and remove carbon dioxide.

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