Standard Science Primary 5 Systems

Which of the following correctly describes the movement of oxygen in the human body?

A Heart -> Lungs -> Blood -> Rest of body
B Lungs -> Heart -> Blood -> Rest of body
C Lungs -> Blood -> Heart -> Rest of body
D Blood -> Lungs -> Heart -> Rest of body
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Worked Solution

Step 1: Oxygen is taken in by the lungs. Step 2: It enters the bloodstream at the air sacs. Step 3: The heart pumps this oxygen-rich blood to the rest of the body.

Correct answer: Lungs -> Blood -> Heart -> Rest of body

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