Involuntary muscles
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Involuntary muscles are smooth, uninucleated, non-branching muscles that are not directly controllable at will. These include the radially arranged iris muscles, the digestive system, reproductive system, major blood vessels, the skin and internal organs, and are all controlled by the autonomic nervous system. These muscles are not as free as the voluntary muscles such as your arms, legs, fingers, etc..
The cardiac muscle in heart can be called an involuntary muscle, although it may be classified separately due to its structural differences. it is controlled by nerve impulses produced by a natural pacemaker called the sinoatrial node, the rate of which is controlled by the autonomic nervous system. smooth muscles are found in the digestive system, reproductive system, major blood vessels, the skin and internal organs, and is also controlled by the autonomic nervous system.
Skeletal muscle is under conscious control and is, therefore, voluntary muscle.
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