Advanced Science Primary 5 Systems

Which of the following correctly describes the change in blood as it passes through the lungs?

A Blood gains carbon dioxide and loses oxygen.
B Blood gains oxygen and loses carbon dioxide.
C Blood gains digested food and loses water.
D Blood loses oxygen and gains nitrogen.
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Worked Solution

Step 1: The lungs are the site of gas exchange. Step 2: Oxygen from inhaled air enters the blood. Step 3: Carbon dioxide from the blood enters the lungs to be exhaled.

Correct answer: Blood gains oxygen and loses carbon dioxide.

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