Ciliated cells lining the trachea are killed with continued exposure to cigarette smoke. Therefore, in a smoker, which of the following functions are impaired?
A. The ability of these cells to move mucus over the tracheal surface.
B. The ability of these cells to transport oxygen.
C. The ability of these cells to remove carbon dioxide.
D. The ability of these cells to produce mucus.
Answer: A
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