Standard Science Primary 5 Systems

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

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

Step 1: Air sacs have very thin walls and are surrounded by blood vessels. Step 2: This structure allows oxygen to enter the blood and carbon dioxide to leave it. Step 3: This is called gas exchange.

Correct answer: To allow for the exchange of gases

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