Standard Science Primary 5 Systems

In which part of the human respiratory system does the exchange of gases take place?

A Windpipe
B Nose
C Air sacs in lungs
D Diaphragm
Show Worked Solution

Worked Solution

Step 1: Gas exchange happens at the end of the respiratory tract. Step 2: Air sacs (alveoli) have thin walls for oxygen and CO2 to cross into/out of the blood.

Correct answer: Air sacs in lungs

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