Where does gas exchange (oxygen and carbon dioxide) primarily occur in the lungs?

Where does gas exchange (oxygen and carbon

Multiple choice — select the best answer

ABronchi
BAlveoli
CTrachea
DBronchioles

✓ Correct answer: B. Alveoli The alveoli are tiny air sacs surrounded by capillaries; their thin walls and large surface area allow oxygen to diffuse into the blood and carbon dioxide to diffuse out. The larger airways (bronchi, bronchioles) conduct air but do not perform gas exchange.

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Topic: Body Systems

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Where does gas exchange (oxygen and carbon dioxide) primarily occur in the lungs?

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