The glottis is primarily involved in which function?

The glottis plays a crucial role in sound production, primarily due to its involvement in the vibration of the vocal cords (also known as vocal folds) when air is expelled from the lungs. When we speak or sing, the airflow from the lungs passes through the narrow opening of the glottis, causing the vocal cords to vibrate and produce sound. The pitch and volume can be modulated by changing the tension and length of the vocal cords, which is influenced by various muscles in the larynx.

While the glottis does have secondary roles in other functions such as allowing air to pass to and from the lungs and providing some airway protection during swallowing, its primary function is indeed the production of sound. This unique capability is what distinguishes the glottis, making it an essential component of human vocalization.

Fluid regulation is not a function associated with the glottis, further supporting that sound production is its primary role.