Final answer:
The opening between the vocal cords of the larynx is called the glottis. It is integral to voice production and protection of the respiratory tract during swallowing, as it gets covered by the epiglottis to prevent food from entering the trachea.
Step-by-step explanation:
The opening between the vocal cords of the larynx is called the glottis. The glottis includes the space that exists between the true vocal cords. It plays a vital role in the production of sound as the true vocal cords, which are white membranous folds, vibrate to create voice. It is also involved in the protection of the respiratory tract during swallowing, as the epiglottis covers the glottis to prevent food and beverages from entering the trachea. The epiglottis is a very flexible piece of elastic cartilage connected to the thyroid cartilage, which functions as a lid over the trachea's opening.