Standard Science Primary 5 Systems

Study the diagram of the respiratory system. Which part represents the site where gaseous exchange occurs?

A Part S (Diaphragm)
B Part Q (Windpipe)
C Part P (Nose)
D Part R (Air Sacs)
Show Worked Solution

Worked Solution

Step 1: Air enters the nose and travels down the windpipe. Step 2: It enters the lungs and reaches the air sacs (alveoli). Step 3: Gaseous exchange happens only at the air sacs where blood vessels are in close contact.

Correct answer: Part R (Air Sacs)

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