Standard Science Primary 5 Systems

What is the function of the air sacs (alveoli) in the lungs?

A To allow for the exchange of gases.
B To produce oxygen for the body.
C To filter dust from the air.
D To pump blood to the heart.
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Worked Solution

Step 1: The air sacs have very thin walls and are surrounded by blood vessels. Step 2: Oxygen moves into the blood, and carbon dioxide moves out into the air sacs.

Correct answer: To allow for the exchange of gases.

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