Which structure is NOT considered part of the respiratory system?

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Multiple Choice

Which structure is NOT considered part of the respiratory system?

Explanation:
Structures involved in breathing include the nose, which filters and conditions incoming air; the larynx, which directs air to the lungs and houses the vocal cords; and the alveoli, tiny sacs where gas exchange occurs. The esophagus is not part of the respiratory system; it belongs to the digestive system and moves swallowed food to the stomach through peristaltic waves. So, the structure that does not belong to the respiratory system is the esophagus.

Structures involved in breathing include the nose, which filters and conditions incoming air; the larynx, which directs air to the lungs and houses the vocal cords; and the alveoli, tiny sacs where gas exchange occurs. The esophagus is not part of the respiratory system; it belongs to the digestive system and moves swallowed food to the stomach through peristaltic waves. So, the structure that does not belong to the respiratory system is the esophagus.

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