What is the function of the vocal cords?

The function of the vocal cords, also known as vocal folds, is primarily to produce sound. Located within the larynx, they act as a barrier that can be opened or closed, which controls the flow of air from the lungs during speech or vocalization. When air passes through the closed vocal cords, they vibrate, creating sound waves. The pitch and volume of the sound can be altered by adjusting the tension and length of the vocal cords, allowing for a wide range of vocal expressions.

The other options describe different functions of the respiratory system. For instance, filtering out foreign particles is primarily the role of cilia and mucus found in the respiratory tract. Preventing food from entering the trachea is the function of the epiglottis, which closes over the larynx during swallowing. Transporting air to the lungs is the overall function of the trachea and bronchial tubes, not the vocal cords themselves. Thus, the primary role of the vocal cords centers around sound production.