Vocal Chords?
Because Helium is lighter than the oxygen and other gases we breathe, when it passes through your vocal chords, it makes them vibrate quicker than the heavier gases like Oxygen-(8) and such. So because they cause your vocal chords to vibrate quicker, it tightens up your vocal chords and makes the pitch of your voice go up.
Your vocal chords are tense during the inhalation
Animals DO have vocal chords.
i think vocal chords work when the flaps of the vocal chords are pushed together to make a noise, then your mouth forms it into words.
helium is less dense than the normal air we breathe, so when you breathe helium out and your vocal chords vibrate, it comes out in a higher pitch tone.
Humans have one pair of vocal folds. They are really not called chords.
The lead singer of Avenges sevenfold tore is vocal chords and he did need surgery.
Your vocal chords do not open or close, they are either vibrating or still. When you breathe they are still, not producing any sound.
Vocal Chords
Conure Parrots do not have vocal chords like a human. Conure Parrots have vocal folds in a structure called the syrinx, not in the laranyx like a humans does.
It just means don't stress your vocal chords, no yelling, screaming, or anything that might cause damage to your vocal chords.