![]() Membrane permeability to calcium increases during this phase, maintaining depolarization and prolonging the action potential. Phase 2 is the plateau phase of the cardiac action potential. This is caused by the movement of charged atoms (called ions) between the inside and outside of the cell, through proteins called ion channels. The cardiac action potential is a brief change in voltage (membrane potential) across the cell membrane of heart cells. What are the action potentials of the heart? ![]() ![]()
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