True about cardiac muscles are all except:

Cardiac muscle consists of striated muscle fibers that branch and unite with each other. It forms the myocardium of the hea.Its fibers tend to be arranged in whorls and spirals, and they have the propey of spontaneous and rhythmic contraction. Specialized cardiac muscle fibers form the conducting system of the hea.Cardiac muscle is supplied by autonomic nerve fibers that terminate in the nodes of the conducting system and in the myocardium.