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Related Concept Videos

Conduction System of the Heart01:19

Conduction System of the Heart

Autorhythmicity is a term that refers to the heart's inherent ability to generate electrical signals and instigate muscle contractions. This self-regulating conduction system within the heart consists of two key components: the pacemaker cells and specialized conducting cells.
The pacemaker cells are located in two primary nodes: the sinoatrial (SA) node and the atrioventricular (AV) node. The SA node pacemaker cells can autonomously depolarize, triggering an action potential that leads to the...
Conduction System of the Heart01:20

Conduction System of the Heart

The cardiac conduction system produces and transmits electrical impulses that prompt myocardial contraction, ensuring efficient heart function. This intricate system ensures that the heart beats in a coordinated and efficient manner, beginning with the atria and then the ventricles. The conduction system optimizes cardiac output by maintaining this precise sequence, which is crucial for adequate blood circulation.
This system relies on the unique properties of nodal and Purkinje cells:...
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase of...
Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several types of...
Cardiac Action Potential01:30

Cardiac Action Potential

Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers01:22

Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers

Class I antiarrhythmic drugs are used to treat various types of arrhythmias or irregular heart rhythms. These drugs block the sodium (Na+) channels in the cardiac cells, thereby affecting the movement of electrical impulses across the heart. Class I antiarrhythmic drugs are divided into three subgroups: Class IA, Class IB, and Class IC, each with distinct mechanisms of action and effects on the heart.
Class 1A Antiarrhythmic Drugs: These drugs work by moderately blocking sodium channels,...

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Related Experiment Video

Updated: Jun 25, 2026

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
09:20

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Is sodium current present in human sinoatrial node cells?

Arie O Verkerk1, Ronald Wilders, Marcel M G J van Borren

  • 1Heart Failure Research Center, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands. A.O.Verkerk@amc.uva.nl

International Journal of Biological Sciences
|February 26, 2009
PubMed
Summary

The fast sodium current (I(Na)) is present and active in human sinoatrial node pacemaker cells, a finding previously unexplored in humans. This discovery offers new insights into cardiac electrophysiology and human heart rhythm regulation.

Keywords:
action potentialshumansion channelssinoatrial nodesodium channels

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Human Physiology

Background:

  • Pacemaker activity in the sinoatrial node is well-studied in animals but poorly understood in humans.
  • The role of the fast sodium current (I(Na)) in human sinoatrial node pacemaker activity remains unknown.

Purpose of the Study:

  • To investigate the presence and function of the fast sodium current (I(Na)) in human sinoatrial node pacemaker cells.
  • To determine if I(Na) contributes to the electrical activity of the human heart's natural pacemaker.

Main Methods:

  • Utilized patch-clamp electrophysiology techniques.
  • Performed experiments on single pacemaker cells isolated from the human sinoatrial node.

Main Results:

  • Observed large inward currents with characteristics of I(Na) in 2 out of 3 tested human sinoatrial node cells.
  • Found that this I(Na) is functionally available at negative membrane potentials (below -60 mV).

Conclusions:

  • Provides strong evidence for the presence of I(Na) in human sinoatrial node pacemaker cells.
  • Suggests a potential role for I(Na) in human cardiac pacemaking, opening new avenues for research.