Which system's major organs include nose, trachea, bronchi, lungs, and diaphragm?

Which system's major organs include nose, trachea, bronchi, lungs, and diaphragm?

• A. Circulatory System
• B. Respiratory System
• C. Nervous System
• D. Immune System

Answer: (B)

Breathing and gas exchange are handled by the respiratory system. The nose filters and conditions air, the trachea and bronchi passage air to the lungs, the lungs provide the sites for oxygen to enter the blood and carbon dioxide to exit, and the diaphragm powers inhalation by changing the chest cavity’s volume. The circulatory system centers on moving blood through the heart and vessels, the nervous system coordinates body activities, and the immune system defends against pathogens, none of which are defined by these airway and lung structures. So the major organs listed belong to the respiratory system.

Breathing and gas exchange are handled by the respiratory system. The nose filters and conditions air, the trachea and bronchi passage air to the lungs, the lungs provide the sites for oxygen to enter the blood and carbon dioxide to exit, and the diaphragm powers inhalation by changing the chest cavity’s volume. The circulatory system centers on moving blood through the heart and vessels, the nervous system coordinates body activities, and the immune system defends against pathogens, none of which are defined by these airway and lung structures. So the major organs listed belong to the respiratory system.