Answer: C - The function of the vocal cords is to produce sound and regulate air passage into the trachea.
The vocal cords, also known as vocal folds, serve two primary functions. Firstly, they are crucial for sound production. When air is expelled from the lungs, it passes through the vocal cords, causing them to vibrate and produce sound, which is the basis of our voice. The pitch and tone of the voice are controlled by varying the tension and spacing of these cords. Secondly, the vocal cords play a role in regulating the passage of air into the trachea. They act as gatekeepers, opening to allow air into the trachea for breathing and closing during swallowing to prevent food or liquid from entering the airway. This dual functionality highlights the vocal cords' importance in communication and respiratory protection.
