Answer:
Play no part in sound production.
Step-by-step explanation:
Larynx is the important organs that are involved in the sound production and in the respiratory system as well. The larynx is also helpful in the relaxation of the cough.
The vestibular fold is also known as the false vocal cord that lies superiorly to the vocal folds. Their main function is to protect the larynx whereas the vestibular folds play an important role in the production of sound. The vestibular folds do not play role in the process of sound production.
Thus, the answer is play no part in sound production.