The glottis is the part of the larynx that contains the vocal cords and the opening between them. It plays a crucial role in producing sound when we speak or sing. When air passes through the glottis, the vocal cords vibrate, creating sound waves that can be shaped into speech by the mouth and tongue. In addition to sound production, the glottis also helps regulate airflow during breathing. It can open and close to control the amount of air entering the lungs. This function is essential for activities like swallowing and coughing, ensuring that food and liquids do not enter the airway.