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.
Correct Answer: C
Solution :
[c] The alveoli do not contain "air" with 20.9% \[{{O}_{2}}\] because incoming air is mixed with air left in the "dead space" of the trachea and bronchi that has had some of the\[{{O}_{2}}\] removed by the lungs.
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