Tightening of the vocal cords is also known as vocal cord dysfunction (VCD). This is a condition in which the muscles of the vocal cords tighten and this can make breathing difficult. It is caused by an autoimmune disorder.
Yes, giraffes have vocal cords and can make sounds.
The change in voice is caused by the helium allowing the vocal cords to vibrate differently in the lighter gas.
they don't sing like male frogs do if that's what you're asking
Yes. Foxes do have vocal cords. how else would the bark or make noise?
Giraffes have no vocal cords, hence they do not make any sound.
Vocal Inflection helps with voice acting such as radio commercials and voice overs. Vocal Inflection as 4 parts: Tempo, Quality, Pitch, and Volume.
You tighten the muscles pulling on them as you exhale, so that they "hum" as you breath out. To make speech or song you use your mouth and tongue as an echo chamber to shape the hum into words or notes. If you hum with your mouth closed you'll hear what the vocal cords can do alone.
they vibrate..
The vocal cords stretch across the opening of the larynx, when you speak muscles make the vocal cords contract, narrowing opening as air rushes through, movement of the vocal cords makes molecules vibrate.
Helium causes your vocal cords to tighten up. This makes your voice go up in pitch. Helium is a harmless gas. It is often used in deep sea diving, which makes the aquanauts living in undersea laboratories sound like Donald Duck. Also, it's fun to do at parties to make it seem likes there a mouse around. I did it once and I laughed my butt off. XD
Because they have no vocal cords.