a twitch is a single stimulus-contraction-relax action sequence in a muscle fiber. They can vary in duration depending on the type of muscle, it's location, internal and external enviromental conditions and other factors.
"The whiskers on your kitten" is the subject of the sentence, and "twitch" is the predication.
Fast twitch fibers
The twitch in your shoulder is just a twitch it does not hurt you at all:>
Slow twitch
You can get a twitch from stimulation or damage to the muscles.
What is Twitch? (that is a sentence.)
The cast of Twitch - 2013 includes: Annabeth Norris as Twitch
Bewitched - 1964 To Twitch or Not to Twitch 4-25 was released on: USA: 14 March 1968
Bewitched - 1964 To Twitch or Not to Twitch 4-25 is rated/received certificates of: Argentina:Atp Australia:G
The twitch in his eye was driving him crazy.
Twitch Film was created in 2004.
I think you are thinking of fast twitch muscles. There are two kinds fast twitch and slow twitch.