Standard Science Primary 5 Systems

Study the flow chart of blood in the human body. What is the main difference between blood flowing at X and blood flowing at Y?

A Blood at Y has more carbon dioxide.
B Blood at X has more oxygen.
C Blood at X has more water.
D Blood at Y has more oxygen.
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Worked Solution

Step 1: Blood at X is moving from the lungs to the heart. Step 2: Lungs oxygenate the blood, so X is oxygen-rich. Step 3: Blood at Y is moving from the body to the heart, carrying waste (carbon dioxide).

Correct answer: Blood at X has more oxygen.

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