Standard 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 for the exchange of gases
C To protect the heart
D To produce mucus
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Worked Solution

Step 1: Air sacs (alveoli) have thin walls and many blood vessels. Step 2: This structure is optimized for oxygen entering and carbon dioxide leaving the blood.

Correct answer: To allow for the exchange of gases

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