What part of the respiratory system contains the vocal cords?

The larynx is the correct answer because it is the anatomical structure that houses the vocal cords, also known as vocal folds. The primary function of the larynx is to facilitate phonation, which is the production of sound, along with protecting the airway during swallowing. The larynx is located between the pharynx and the trachea and is composed of cartilage, muscles, and mucous membranes.

It plays a crucial role not only in voice production but also in airway protection and regulation of airflow during breathing. In contrast, the pharynx serves as a passage for air and food but does not contain the vocal cords itself. The trachea is responsible for conducting air to the lungs and does not have vocal cords, while the bronchi branches off from the trachea and lead to the lungs, where gas exchange occurs. Hence, the larynx stands out as the unique structure that specifically contains the vocal cords, making it essential for speech production.