Standard Science Primary 5 Systems

The diagram shows the path of blood flow in the human body. Which arrow represents blood that is rich in carbon dioxide?

A Arrow D (Heart to Lungs)
B Arrow B (Heart to Rest of Body)
C Arrow C (Rest of Body to Heart)
D Arrow A (Lungs to Heart)
Show Worked Solution

Worked Solution

Step 1: Trace the blood flow. Body cells use oxygen and produce carbon dioxide. Step 2: Blood returning from the body to the heart (C) is rich in carbon dioxide. Step 3: The heart then pumps this blood to the lungs (D) to remove carbon dioxide.

Correct answer: Arrow C (Rest of Body to Heart)

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