part of part of contributes to morphology of heart myocardium conducting system of heart EFO:0003909 EHDAA2 divides the system from the tissue EHDAA2:0004185 EMAPA:35428 EV:0100025 FMA:9476 MA:0000094 MESH:D006329 TAO:0005063 The cardiac conduction system consists of specialized cardiomyocytes that regulate the frequency of heart beat[GO] The fish heart displays clear polarity of contraction in a posterior-to-anterior direction. The contraction waves originate in the sinus venosus and terminate in the conus arteriosus. The nodal phenotype persists in the inflow region of the heart, varying from the venosinus to the sinoatrial junctional areas in different species . Similar to the mammalian situation, pacemaker tissue with a lower intrinsic rhythmicity is also found at the atrioventricular junction.[uncertain][VHOG] UBERON:0002350 VHOG:0001271 ZFA:0005063 cardiac conducting system cardiac conduction system cardiac impulse conducting system cardionector central conduction system complexus stimulans cordis heart conduction system impulse conducting system systema conducente cordis uberon cardiac muscle tissue of myocardium conducting tissue of heart