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Smooth muscles
it is a problem in the nervous system
Involuntary muscle movement includes peristalsis in the GI tract and the beating of your heart. Generally involuntary muscles are smooth muscles (intestines, blood vessels), but the cardiac muscles are sometimes categorized as striated due to their structural similarities to skeletal muscles.
It is a movement disorder that causes involuntary spasms in the muscles of the body. It can be generalised affecting the whole body or focal affecting specific parts eg writers cramp, blepharospasm.
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Atrophy
Shivering causes you too involuntary contract and relax your muscles to increase heat production.
the movement of muscles which keeps the surface for gaseous supplied with oxygen causes breathing
Locomotion
The movement is caused by the cremasteric muscles. Here is more information: http://en.wikipedia.org/wiki/Testicle
The heart is an involuntary muscle.Involuntary muscles are smooth muscles that are not directly controllable at will. Voluntary muscles are controllable like those found in your arms, legs, hands, etc.
An unusual signal from the brain causes involuntary movements of the head and neck. Sometimes it takes a good neurologist to trace down the source of those strange electrical signals.