Once threshold is reached, L-type calcium channels open, causing rapid depolarization. Phase 3 (Repolarization): Potassium ( K+cap K raised to the positive power ) channels open, allowing K+cap K raised to the positive power efflux to return the cell to its minimum potential. The Non-Pacemaker (Ventricular) Action Potential
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It focuses on core concepts, making it more digestible than encyclopedic textbooks. Once threshold is reached, L-type calcium channels open,