they relate because they dont move. ivoluntary muscle means that they dont move. the smooth muscle doesnt move at all only the skeletal muscle does.
because most movements can not be consciously controlled.
involuntary...like the heart or stomach
Involuntary muscles (such as the heart, the sphincters, etc.) are traditionally smooth muscle.
Smooth muscles are involuntary, as are cardiac muscles. Only skeletal muscles are voluntary.