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Which diagram correctly illustrates gas exchange in the lungs, showing the diffusion of oxygen and carbon dioxide?
Biology
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The correct diagram is B.
In the lungs, gas exchange occurs between the alveoli and the capillaries.
- Oxygen (O₂) from the inhaled air in the alveoli diffuses into the blood.
- Carbon dioxide (CO₂), a waste product carried by the blood, diffuses out of the blood into the alveoli to be exhaled.
Diagram (B) correctly shows the arrow for O₂ pointing from the alveolus into the blood, and the arrow for CO₂ pointing from the blood into the alveolus.
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