Thelarynxis commonly referred to as the voice box. It is located in the neck and performs several functions, including breathing, producing sound, and protecting the trachea against food aspiration. The larynx houses the vocal cords, which vibrate to produce sound when air is expelled from the lungs. The other options refer to different parts of the respiratory and digestive systems:

Pharynx: A muscular tube that serves both respiratory and digestive functions by connecting the nasal and oral cavities to the larynx and esophagus.

Glottis: The part of the larynx consisting of the vocal cords and the opening between them. It is not a structure itself but rather a component of the larynx.

Trachea: Also known as the windpipe, it is a tube that connects the larynx to the bronchi of the lungs, allowing the passage of air.