heart contraction________________
regulation of blood circulation__|
                                 regulation of heart contraction
                                  |__cardiac conduction
                                      |__cell communication involved in cardiac conduction
                                      |   |__atrial cardiac muscle cell to AV node cell communication(+)
                                      |   |__AV node cell to bundle of His cell communication(+)
                                      |   |__bundle of His cell to Purkinje myocyte communication(+)
                                      |   |__cell communication by electrical coupling involved in cardiac conduction(+)
                                      |   |__cell-cell signaling involved in cardiac conduction(+)
                                      |   |__Purkinje myocyte to ventricular cardiac muscle cell communication(+)
                                      |   |__SA node cell to atrial cardiac muscle cell communication(+)
                                      |__regulation of cardiac conduction
                                      |   |__negative regulation of cardiac conduction
                                      |   |__positive regulation of cardiac conduction
                                      |   |__regulation of atrial cardiac muscle cell action potential(+)
                                      |__regulation of heart rate by cardiac conduction
                                      |__regulation of the force of heart contraction by cardiac conduction