What is is a sudden, violent, involuntary contraction of one or more muscles?

Answer

A sudden, violent, involuntary contraction of one or more muscles is a spasm. It can be a one time thing, or continuous. It can also happen where muscles spams alternately.
Q&A Related to "What is is a sudden, violent, involuntary contraction..."
Answer A muscle spasm. Hiccup
http://wiki.answers.com/Q/What_is_the_sudden_tight...
You call it a muscle spasm. The Hiccups. spasm.
http://wiki.answers.com/Q/What_is_the_medical_term...
A spasm.
http://wiki.answers.com/Q/What_is_a_sudden_painful...
tissues that help bones move.
http://wiki.answers.com/Q/What_are_sudden_painful_...
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