Jones & Bartlett Learning

i. Phase 4: Cardiac cells are at rest, waiting for: (a) Generation of a spontaneous impulse from within (automaticity) (b) Transfer of an impulse from an adjacent cardiac cell . ii. Phase 0: Begins with the rapid influx of sodium ions through channels in the cardiac cell (a) Potassium ions begin to exit the cell, and depolarization occurs. iii. ................
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