Which structure marks the boundary between the upper and lower airways?

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The boundary between the upper and lower airways is at the cricoid cartilage. This ring-shaped cartilage sits at the inferior border of the larynx and marks where the airway transitions to the trachea. The upper airway includes the nose, mouth, pharynx, and larynx, while the lower airway begins with the trachea and extends into the lungs. So, the cricoid cartilage is the key landmark that separates the upper structures from the lower passageways. The larynx itself is part of the upper airway, and the trachea begins below the cricoid, which is why the cricoid cartilage is the best answer.