A response.
Twitch
A twitch is the rapid rise and fall in force produced by a muscle fiber after a single action potential.
A: A Twitch
muscle twitch
muscle twitch
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.
Smooth muscle
"The whiskers on your kitten" is the subject of the sentence, and "twitch" is the predication.
Generally not as there are many parallel fibres that are part of the same circuit and some sort of coordination between the fibres are needed before a muscle twitch can be detected. This is either temporal or spatial summation.
Fast twitch fibers
The twitch in your shoulder is just a twitch it does not hurt you at all:>