Which system includes the nose, nasal passages, nasopharynx, larynx, trachea, bronchi, and lungs?

Which system includes the nose, nasal passages, nasopharynx, larynx, trachea, bronchi, and lungs?

• A. Respiratory system
• B. Endocrine system
• C. Digestive system
• D. Circulatory system

Answer: (A)

Breathing and gas exchange are the focus here. The listed structures—nose, nasal passages, nasopharynx, larynx, trachea, bronchi, and lungs—are all components of the respiratory system. This system filters, moistens, and warms the air we inhale, conducts it down to the lungs, and facilitates the exchange of oxygen and carbon dioxide in the alveoli. The other systems don’t include these airway and lung components: the endocrine system handles hormones, the digestive system processes food, and the circulatory system moves blood and nutrients but doesn’t comprise the airway and lung organs.

Breathing and gas exchange are the focus here. The listed structures—nose, nasal passages, nasopharynx, larynx, trachea, bronchi, and lungs—are all components of the respiratory system. This system filters, moistens, and warms the air we inhale, conducts it down to the lungs, and facilitates the exchange of oxygen and carbon dioxide in the alveoli. The other systems don’t include these airway and lung components: the endocrine system handles hormones, the digestive system processes food, and the circulatory system moves blood and nutrients but doesn’t comprise the airway and lung organs.