A: A Twitch
A single contraction that lasts only a fraction of a second is called a muscle twitch. Its when the muscle seizes up for a quick pulse then relaxes.
constant contraction of a muscle is called the muscle tone
A twitch contraction is a single, brief contraction of a muscle fiber in response to a stimulus. It is the smallest unit of muscle contraction and is not strong enough to produce movement of a limb.
It is called concentric isotonic contraction.
An involuntary muscle contraction is called a spasm.
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tetanic contraction.
Tonus is the continous baseline muscle tone in the body.
Spasm
An eccentric contraction is one that causes a muscle to lengthen.
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Often it is called a cramp.