Standard Science Primary 5 Systems

Where exactly does the exchange of gases take place in the human lungs?

A In the ribcage.
B In the windpipe.
C In the diaphragm.
D In the air sacs.
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Worked Solution

Step 1: Air travels through the nose and windpipe into the lungs. Step 2: It reaches tiny balloon-like structures called air sacs (alveoli). Step 3: Oxygen enters the blood and carbon dioxide leaves the blood here.

Correct answer: In the air sacs.

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