Which structure is NOT part of the lower respiratory system?

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Multiple Choice

Which structure is NOT part of the lower respiratory system?

Explanation:
Airway divisions distinguish upper from lower pathways. The pharynx sits in the upper airway, serving as a passage for both air and food and not participating in gas exchange. The lower respiratory system includes the larynx, trachea, bronchi, and alveoli—structures that conduct air deeper into the lungs and carry out gas exchange. So the pharynx is not part of the lower respiratory system.

Airway divisions distinguish upper from lower pathways. The pharynx sits in the upper airway, serving as a passage for both air and food and not participating in gas exchange. The lower respiratory system includes the larynx, trachea, bronchi, and alveoli—structures that conduct air deeper into the lungs and carry out gas exchange. So the pharynx is not part of the lower respiratory system.

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