Which of the following is a major passage in the body that is part of the respiratory system?

• A. Trachea
• B. Esophagus
• C. Aorta
• D. Ureter

Answer: (A)

Verified step by step guidance

1. Step 1: Begin by identifying the primary function of the respiratory system, which is to facilitate gas exchange (oxygen intake and carbon dioxide removal). This will help narrow down the options to structures involved in this process.
2. Step 2: Examine the listed options: Trachea, Esophagus, Aorta, and Ureter. Consider their anatomical roles and determine which one is directly involved in the respiratory system.
3. Step 3: Recall that the trachea is a major airway that connects the larynx to the bronchi, allowing air to pass to and from the lungs. This makes it a key structure in the respiratory system.
4. Step 4: Understand that the esophagus is part of the digestive system, responsible for transporting food from the mouth to the stomach, and is not involved in respiration.
5. Step 5: Note that the aorta is part of the circulatory system, carrying oxygenated blood from the heart to the rest of the body, and the ureter is part of the urinary system, transporting urine from the kidneys to the bladder. Neither is related to the respiratory system.