Air moves through the respiratory system in a continuous cycle. Which of the following correctly describes the movement of air through the parts of the respiratory system?

Air travels from the nose down the trachea, then through the branching airways, including the bronchi and bronchioles, to the alveoli. Oxygen then moves from the alveoli into the blood and is carried to body cells. Choice A gives the correct order for the parts it lists; choice B incorrectly places the alveoli before the bronchioles.

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