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 rich in carbon dioxide
B Rich in oxygen and poor in carbon dioxide
C Poor in oxygen and rich in carbon dioxide
D Poor in oxygen and poor in carbon dioxide
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Worked Solution

Step 1: Gas exchange occurs in the lungs. Step 2: Blood picks up oxygen and gives up carbon dioxide. Step 3: Thus, blood returning to the heart from the lungs is oxygen-rich.

Correct answer: Rich in oxygen and poor in carbon dioxide

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