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| Description: An ECG (above) is a graph showing electrical changes that can be detected by electrodes attached to the skin (left). The changes arise as a result of the activity of the SA node and the transmission of action potentials through the heart. Picture Stats: Views: 69 Filesize: 327.99kB Height: 990 Width: 1460 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=47575 |