The Alveoli of the Lungs Do Not Contain Air with 20.9

question 224

Multiple Choice

The alveoli of the lungs do not contain air with 20.9% O₂ (i.e., the percentage in dry air) because

• A) we normally do not ventilate our lungs at a high enough rate.
• B) the lungs have too many alveoli to ventilate.
• C) there is dead space in the trachea, bronchi, and lungs.
• D) the trachea and bronchi are too small in volume to contain this amount of O₂.
• E) some O₂ has been exchanged before reaching the alveoli.

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