Foundation 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 produce oxygen for the body.
C To allow gaseous exchange to occur.
D To filter dust from the air.
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Worked Solution

Step 1: Air sacs are where oxygen enters the blood and carbon dioxide leaves it. Step 2: This process is called gaseous exchange. Step 3: It is the main function of the lungs.

Correct answer: To allow gaseous exchange to occur.

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