Standard Science Primary 5 Systems

Study the diagram of the human circulatory system. Which arrow represents blood that is rich in oxygen?

A Rest of the body to heart
B Small intestine to heart
C Lungs to heart
D Heart to lungs
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Worked Solution

Step 1: Identify the gas exchange site (Lungs). Step [2-9]: Oxygen enters the blood in the lungs. Step [2-9]: Therefore, the blood traveling from the lungs to the heart is oxygen-rich.

Correct answer: Lungs to heart

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