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| Description: Influences on the Conduction System The autorhythmic fibers in the SA node are the natural pacemaker of the heart because they initiate action potentials most often Signals from the nervous system and hormones (like epinephrine) can modify the heart rate and force of contraction but they do not set the fundamental rhythm An action potential in a ventricular contractile fiber is characterized by a rapid depolarization, plateau, and repolarization Picture Stats: Views: 178 Filesize: 361.27kB Height: 632 Width: 1224 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=41030 |