Which of the following is NOT a major structure of the respiratory system?

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Multiple Choice

Which of the following is NOT a major structure of the respiratory system?

Explanation:
Breathing relies on structures that conduct air and the muscles that drive respiration. The nose serves as the entry point and also filters, warms, and humidifies air. The larynx acts as a passage for air and helps protect the airway during swallowing, while the diaphragm is the main breathing muscle that expands the chest cavity to draw air into the lungs. The esophagus, however, belongs to the digestive system and carries swallowed food to the stomach; it does not participate in gas exchange or airway management. So the esophagus isn’t a major structure of the respiratory system.

Breathing relies on structures that conduct air and the muscles that drive respiration. The nose serves as the entry point and also filters, warms, and humidifies air. The larynx acts as a passage for air and helps protect the airway during swallowing, while the diaphragm is the main breathing muscle that expands the chest cavity to draw air into the lungs. The esophagus, however, belongs to the digestive system and carries swallowed food to the stomach; it does not participate in gas exchange or airway management. So the esophagus isn’t a major structure of the respiratory system.

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