Standard Science Primary 5 Systems

Where exactly does gaseous exchange take place in the human respiratory system?

A Nose
B Trachea
C Air sacs
D Gullet
Show Worked Solution

Worked Solution

Step 1: Air enters lungs and reaches the air sacs (alveoli). Step 2: Air sacs are surrounded by blood capillaries. Step 3: Oxygen enters the blood and carbon dioxide leaves the blood here.

Correct answer: Air sacs

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