What distinguishes the appearance of each muscle types?

Skeletal muscle appears striated and is multinucleated, with long, cylindrical fibers that are under voluntary control. Cardiac muscle also has striations but consists of shorter, branched fibers with a single central nucleus, and it operates involuntarily. Smooth muscle lacks striations, has spindle-shaped fibers, and is also involuntary, featuring a single central nucleus. Each type's unique structure reflects its specific function in the body.