Chest pain is not a symptom you should ever ignore, for obvious reasons. Chest pain, as almost anyone knows, may indicate a cardiac problem. For this reason alone, if you have chest pain you should be evaluated by a doctor.
Definition of cardiac muscle. : the principal involuntary-muscle tissue of the vertebrate heart made up of striated fibers joined at usually branched ends and functioning in synchronized rhythmic contraction.
cardiac pacemaker, SA node, sinoatrial node, pacemaker-a specialized bit of heart tissue that controls the heartbeat. papillary muscle-any of several muscles associated with the atrioventricular valves; the papillary muscles contract during systole to prevent regurgitation of blood into the atria.. cardiac muscle-the muscle tissue of the heart; adapted to continued rhythmic contraction. heart muscle. muscular tissue, muscle-animal tissue consisting predominantly of contractile cells.