Advanced Science Primary 5 Systems

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

A To store air for long periods
B To protect the lungs from dust
C To pump blood to the heart
D To exchange oxygen and carbon dioxide
Show Worked Solution

Worked Solution

Step 1: Air enters the lungs and reaches the alveoli (air sacs). Step 2: Oxygen passes from the air into the blood. Step 3: Carbon dioxide passes from the blood into the air to be exhaled.

Correct answer: To exchange oxygen and carbon dioxide

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