Which of the following is part of the lower respiratory system?

The larynx, which is the correct choice, is indeed a component of the lower respiratory system. The lower respiratory system includes structures that are involved in the conduction of air to the lungs and the exchange of gases, primarily located below the larynx. The larynx serves as a passageway for air and also plays a vital role in sound production and protecting the airway during swallowing.

In contrast, the other options—nose, nasal cavity, and pharynx—are part of the upper respiratory system. The nose and nasal cavity are responsible for filtering, warming, and humidifying the air we breathe, while the pharynx serves as a conduit for both air and food before reaching the larynx. Understanding the distinction between the upper and lower respiratory systems helps clarify the functions and anatomical location of each structure.