The alveoli of the lungs do not contain air with 20.9% oxygen 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 and bronchi.
D) the trachea and bronchi are too small in volume
E) some O2 has been exchanged before reaching the alveoli.
Correct Answer:
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