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| Description: The sinoatrial (SA) node in the wall of the right atrium, is the cardiac pacemaker – it generates about 70 action potentials per minute Gap junctions between adjacent cells allow action potentials generated by the SA node to spread across the atria The signal spreads from the SA node to the atrioventricular (AV) node, then to junctional fibers in the septum, so the heart contracts from the bottom up (cardiac AV node Picture Stats: Views: 726 Filesize: 302.51kB Height: 1007 Width: 1153 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=47564 |