Which of the following is included in the lower respiratory tract?

The bronchi are indeed part of the lower respiratory tract. This area includes the structures that carry air to the lungs and facilitate gas exchange. Specifically, once the air passes through the trachea, it divides into left and right bronchi, which further branch into smaller bronchioles leading into the alveoli where oxygen and carbon dioxide exchange occurs.

In contrast, the nose, larynx, and mouth are components of the upper respiratory tract. The nose is primarily responsible for filtering, warming, and humidifying the air entering the respiratory system. The larynx, often referred to as the voice box, plays a role in sound production and also acts as a passageway for air entering the trachea. The mouth can serve as an alternative pathway for air but is not typically identified as part of the respiratory tract's primary function. Therefore, the classification of bronchi as part of the lower respiratory tract aligns with the anatomical and functional divisions of the respiratory system.