Standard Science Primary 5 Systems

What is the main function of the air sacs in the lungs?

A To pump blood
B To exchange gases
C To protect the heart
D To digest food
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Worked Solution

Step 1: Air sacs (alveoli) are where the respiratory and circulatory systems meet. Step 2: Oxygen enters the blood and carbon dioxide leaves the blood here.

Correct answer: To exchange gases

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