Action potential of sinoatrial node, illustration. The 4-phase membrane potential of sinoatrial node cells is unstable and can be depolarized spontaneously. After depolarization reaches the threshold potential, it triggers a new action potential. This electrophysiological feature is called automaticity. In the human heart, the sinoatrial node has the strongest self-discipline and the fastest rate of 4-phase spontaneous depolarization, and determines heart rate. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / CHONGQING TUMI TECHNOLOGY LTD |
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