Cardiac action potential - Wikipedia
Action potential activity within the heart can be recorded to produce an electrocardiogram (ECG). This is a series of upward and downward spikes (labelled P, Q, R, S and T) that represent the …
Depolarization vs. Repolarization of the Heart (2024)
2024年10月18日 · Depolarization is caused by the influx of sodium (Na+) ions into the heart cells, making the inside of the cells more positive and triggering contraction. Repolarization occurs …
Cardiac Ion Channels | Circulation: Arrhythmia and ...
2009年4月1日 · The rate of depolarization in phase 0 is much slower than that in the working myocardial cells and results in slow propagation of the cardiac impulse in the nodal regions …
Cardiac electrophysiology: Action potential, automaticity and ...
Phase 0 (depolarization): Upon stimulation, rapid depolarization occurs via influx (inward flow) of sodium (Na+) and the cell becomes positively charged (approximately 20 mV). Phase 1 (early …
Physiology, Cardiac Repolarization Dispersion and Reserve
2023年4月17日 · Delayed repolarization in the human myocardium relies mainly on the vast diversity of cardiac potassium channels but also on a particular redundancy in the heart known …
Sinoatrial Node Action Potentials - CV Physiology
Cells within the sinoatrial (SA) node are the primary pacemaker site within the heart. These cells are characterized as having no true resting potential, but instead generate regular, …
Physiology, Action Potential - StatPearls - NCBI Bookshelf
2023年5月8日 · A neuronal action potential has three main stages: depolarization, repolarization, and hyperpolarization. The initial depolarization is determined by the cell’s threshold voltage, …