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Example Questions
Example Question #21 : Respiratory Physiology
Which of the following is the actual sites of gas exchange?
Possible Answers:
bronchioles
pleural spaces
trachea
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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