Phase 2The Action Potential Plateau Cardiac action potentials have uniquely long periods of time during which the potential remains depolarized near 0 mV plateau. So once again when the membrane potential reaches threshold voltage-gated sodium channels open and once those open sodium ions are going to rush into the cell making the membrane potential more positive and that is depolarization. Action Potential Howmed Basic Anatomy And Physiology Human Anatomy And Physiology Medical School Studying Relatively few channels are open during the plateau and thus the total membrane conductance is low. . Depolarization The first phase of the action potential is the rising phase called depolarization which occurs due to a stimulus and causes the opening of voltage-gated sodium channels. Voltage gated K channels are close C. If a depolarization reaches the threshold a different type of response called an action potential will be triggered.
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