Foundation Science Primary 5 Systems

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

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

Step 1: Air sacs (alveoli) are surrounded by blood vessels. Step [2-9]: Oxygen passes into the blood and carbon dioxide passes out. Step [2-9]: This process is known as gaseous exchange.

Correct answer: To allow exchange of gases

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