What structure contains the vocal cords that produce sound when air passes through them?

The larynx is the correct structure that houses the vocal cords, which are essential for producing sound. When air from the lungs passes through the larynx, it vibrates the vocal cords, creating sound waves. The pitch and quality of the sound can be modified by altering the tension and length of the vocal cords, as well as the shape of the surrounding structures.

In contrast, the pharynx serves primarily as a passage for air and food and does not participate directly in sound production. The syrinx, found in birds, is analogous to the larynx but is a unique structure that allows for the production of complex sounds specific to avian species. The bronchi, the air passages that lead from the trachea to the lungs, play a role in directing air but are not involved in sound generation. This distinction emphasizes the unique function of the larynx in vocalization among mammals.