Human Anatomy and Physiology : Help with Gas Exchange

Study concepts, example questions & explanations for Human Anatomy and Physiology

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Example Questions

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Example Question #21 : Respiratory Physiology

Which of the following is the actual sites of gas exchange?

Possible Answers:

trachea

pleural spaces

bronchioles

alveoli

Correct answer:

alveoli

Explanation:

Alveoli are the terminal point of the respiratory zone and closest to the blood vessels in the lung. Since gas exchange uses diffusion, using alveoli makes sense because they are closer to the blood vessels.

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