Standard Science Primary 5 Systems

What happens to the air we inhale when it reaches the air sacs in the lungs?

A Oxygen enters the blood and carbon dioxide leaves the blood.
B The air is filtered for dust only.
C Both oxygen and carbon dioxide enter the blood.
D Carbon dioxide enters the blood and oxygen leaves the blood.
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Worked Solution

Step 1: The lungs are the site of gaseous exchange. Step 2: Oxygen is needed by the body, so it moves from air to blood. Step 3: Carbon dioxide is a waste product, so it moves from blood to air to be exhaled.

Correct answer: Oxygen enters the blood and carbon dioxide leaves the blood.

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