Standard Science Primary 5 Systems

Which statement correctly describes how the respiratory and circulatory systems work together?

A The respiratory system removes carbon dioxide from the heart.
B The respiratory system pumps blood to the lungs.
C The circulatory system takes in oxygen from the air.
D The circulatory system transports oxygen from the lungs to all parts of the body.
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Worked Solution

Step 1: The respiratory system brings oxygen into the lungs. Step 2: Oxygen enters the blood in the lungs. Step 3: The circulatory system (blood and heart) then carries this oxygen to the rest of the body.

Correct answer: The circulatory system transports oxygen from the lungs to all parts of the body.

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