Standard Science Primary 5 Systems

Which statement correctly describes the blood flowing from the lungs to the heart?

A It is rich in carbon dioxide.
B It is rich in oxygen.
C It is flowing at very low pressure.
D It contains no waste materials.
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Worked Solution

Step 1: Blood goes to lungs to exchange carbon dioxide for oxygen. Step 2: Gaseous exchange occurs in the air sacs. Step 3: Oxygenated blood returns to the heart to be pumped to the body.

Correct answer: It is rich in oxygen.

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