An oxygen molecule moving from the mouth to an alveolus encounters structures in which of the sequences listed below?

A. pharynx>larynx>trachea
B. larynx>pharynx>trachea
C. trachea>pharynx>larynx
D. larynx>trachea>pharynx


Answer: A. pharynx>larynx>trachea

Biology & Microbiology

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