Cardiac Performance, Dr. D. Penney




Actions of Sympathetic Neurons to the Heart (through release of norepinephrine)

...... Site ................................ Action .......................................... Affecting ......

  • sino-atrial node ................... increases heart rate ................................ chronotropicity

  • atrial myocardium ................ increases atrial force .............................. inotropicity

  • atrio-ventricular node ............ speeds AV conduction ............................ chronotropicity

  • atrio-ventricular node ............ increases conduction / decreases refractoriness ... chronotropicity

  • ventricular myocardium ......... increases ventricular force ........................... inotropicity




    Last changed 03/22/03


    Click to Return