Question

(a) What is the name of the strings in the human voice box which vibrate to produce sound?

(b) What makes these strings vibrate?

Answer 1

(a) The vocal folds, also known commonly as vocal cords or voice reeds, are composed of twin infoldings of mucous membrane stretched horizontally, from back to front, across the larynx.
(b) They vibrate, modulating the flow of air being expelled from the lungs during phonation.