What structure contains the vocal cords in the human body?

The larynx is the structure that contains the vocal cords, also known as vocal folds. Located in the upper respiratory tract, the larynx serves several crucial functions related to breathing and sound production. When air passes through the larynx, it causes the vocal cords to vibrate, which produces sound. The larynx also acts as a passageway for air traveling to and from the lungs, providing a protective mechanism by preventing food and liquid from entering the airway during swallowing.

In contrast, the other structures mentioned do not contain the vocal cords. The lymphatic system is primarily involved in immune functions and fluid homeostasis; the trachea serves as the main airway passage connecting the larynx to the bronchi of the lungs but does not house the vocal cords; and the pharynx is an anatomical region that connects the nasal and oral cavities to the larynx and esophagus but also does not contain the vocal cords. Understanding the distinct functions and locations of these structures clarifies why the larynx is the correct answer.