Standard Science Primary 5 Systems

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

A To produce oxygen for the body
B To filter dust from the air
C To pump blood to the heart
D To increase surface area for faster gas exchange
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Worked Solution

Step 1: Air sacs (alveoli) are where oxygen enters and CO2 leaves the blood. Step 2: Thousands of tiny sacs provide a massive surface area. Step 3: This ensures gas exchange happens quickly enough to support life.

Correct answer: To increase surface area for faster gas exchange

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