1 Battle star, an award issued to U.S. Navy ships for participation in battles.  Battlestar (fictional spaceship), a type of spaceship in the original and new television series Battlestar Galactica.
Smooth muscle is fundamentally different from skeletal muscle and cardiac muscle in terms of structure, function, regulation of contraction, and excitation-contraction coupling. Smooth muscle cells known as myocytes, have a fusiform shape and, like striated muscle, can tense and relax.
Cardiac muscle is also sometimes considered to be involuntary muscle. However, cardiac muscle shares features of both smooth and skeletal muscle tissue. It is striated like skeletal muscle tissue, but its contractions are involuntary, like those of smooth muscle tissue.Cardiac muscle is unique in that is particularly invulnerable to fatigue.nvoluntary muscles are muscles that are not controllable consciously, and instead contract due to unconscious impulses sent by the autonomic nervous system or certain specialized cells or hormones. Both smooth muscle and cardiac muscle can be classified as involuntary muscles.