Standard Science Primary 5 Systems

Which of the following correctly describes the blood flowing from the lungs to the heart?

A Rich in oxygen and poor in carbon dioxide
B Rich in carbon dioxide and poor in oxygen
C Rich in digested food and oxygen
D Rich in waste materials and oxygen
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Worked Solution

Step 1: Identify the source (Lungs) and destination (Heart). Step 2: Gaseous exchange occurs in the lungs, where blood picks up oxygen and releases carbon dioxide. Step 3: Therefore, blood returning from the lungs is oxygen-rich.

Correct answer: Rich in oxygen and poor in carbon dioxide

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