Standard Science Primary 5 Systems

Which of the following describes the correct path of oxygen when we breathe in?

A Mouth -> Stomach -> Lungs -> Blood
B Nose -> Air tubes -> Lungs -> Heart -> Rest of the body
C Nose -> Lungs -> Air tubes -> Heart -> Rest of the body
D Nose -> Heart -> Lungs -> Rest of the body
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Worked Solution

Step 1: Oxygen enters through the nose/mouth and goes down air tubes to the lungs. Step 2: In the lungs, oxygen enters the blood. Step 3: Oxygenated blood goes to the heart to be pumped to the rest of the body.

Correct answer: Nose -> Air tubes -> Lungs -> Heart -> Rest of the body

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