All of the following statements regarding the hea are true Except

The sinoatrial node receives a nerve supply; however, this node initiates the heabeat autonomously. The autonomic innervation modulates the rate of depolarization of the sinoatrial node, thereby modulating the hea rate. The sinoatrial node is composed of specialized cardiac muscle cells that depolarize spontaneously at a greater rate than that of other cardiac muscle cells. Because cardiac muscle cells contact each other electrically through gap junctions at the intercalated discs, the depolarization of the sinoatrial node drives the other cardiac muscle cells of the atrium to depolarize at the same rate as the node.