Mechanisms of Sodium and Potassium Ion Transport in Cardiac Action Potentials

DESCRIPTION

This text explores the roles of sodium (Na+) and calcium (Ca++) ions in the cardiac action potential phases, focusing on their transport mechanisms across the cell membrane. It details the active transport by Na+-K+ ATPase and the impact of various electrolyte fluxes during different phases of depolarization and repolarization. The implications for electrocardiogram (ECG) readings and cardiac function are also discussed to enhance the understanding of cardiac physiology in health and disease.

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Feb 10, 2026

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Mechanisms of Sodium and Potassium Ion Transport in Cardiac Action Potentials

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Ca++ Na+ Slowed Electrolyte Flux Na+ Intracellular Active transport Na+-K+ ATPase Cell membrane Extracellular K+ K+ K+ Ca++ Phase 2 Phase 1 0 Cardiac Action Potential Phase 0 Phase 3 Depolarisation threshold Phase 4 ECG Complex