Standard 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 allow gaseous exchange between the lungs and blood.
C To filter dust from the air.
D To produce oxygen for the body.
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Worked Solution

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

Correct answer: To allow gaseous exchange between the lungs and blood.

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