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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...
Specialized Characteristics of Cardiac Muscles01:27

Specialized Characteristics of Cardiac Muscles

The primary role of cardiac muscles is to propel blood throughout the cardiovascular system. The cardiac muscle cells, or cardiomyocytes, exhibit specialized characteristics that allow them to perform this function.
Cardiac muscle cells are smaller than skeletal muscles, averaging 10–20 mm in diameter and 50–100 mm in length. However, they have large energy demands for continuous contraction and relaxation. This energy is almost exclusively derived from aerobic metabolism of energy reserves in...
Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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

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Related Experiment Video

Updated: May 19, 2026

Generation of Murine Cardiac Pacemaker Cell Aggregates Based on ES-Cell-Programming in Combination with Myh6-Promoter-Selection
08:52

Generation of Murine Cardiac Pacemaker Cell Aggregates Based on ES-Cell-Programming in Combination with Myh6-Promoter-Selection

Published on: February 17, 2015

Cardiac Pacemaker Cells Harness Stochastic Resonance to Ensure Fail-Safe Operation at Low Rates Bordering on Sinus

Akihiro Okamura1, Isabella K He1, Alexander V Maltsev1

  • 1National Institute on Aging, NIH, Baltimore, MD 21224, USA.

Biorxiv : the Preprint Server for Biology
|May 18, 2026
PubMed
Summary

Sinoatrial node cells use stochastic resonance to ensure regular heartbeats, especially during slow heart rates. This mechanism, amplified by coupled signaling, helps prevent heart pauses and ensures reliable pacemaker function.

Keywords:
Sinoatrial nodebradycardiapacemakersinus arreststochastic resonance

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Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
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Advanced Cardiac Rhythm Management by Applying Optogenetic Multi-Site Photostimulation in Murine Hearts
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Advanced Cardiac Rhythm Management by Applying Optogenetic Multi-Site Photostimulation in Murine Hearts

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Related Experiment Videos

Last Updated: May 19, 2026

Generation of Murine Cardiac Pacemaker Cell Aggregates Based on ES-Cell-Programming in Combination with Myh6-Promoter-Selection
08:52

Generation of Murine Cardiac Pacemaker Cell Aggregates Based on ES-Cell-Programming in Combination with Myh6-Promoter-Selection

Published on: February 17, 2015

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

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

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08:43

Advanced Cardiac Rhythm Management by Applying Optogenetic Multi-Site Photostimulation in Murine Hearts

Published on: August 26, 2021

Area of Science:

  • Cardiac Electrophysiology
  • Computational Biology
  • Cellular Physiology

Background:

  • The sinoatrial node (SAN) is the heart's primary pacemaker, responsible for initiating heartbeats.
  • Recent studies reveal heterogeneous signals within the SAN, including subthreshold signals in dormant cells, raising questions about their role in heartbeat generation.
  • This study investigates the hypothesis that SAN cells utilize stochastic resonance for robust pacemaker function, particularly under conditions of slow heart rates or sinus arrest.

Purpose of the Study:

  • To test the hypothesis that sinoatrial node pacemaker cells employ stochastic resonance to ensure reliable heartbeat initiation.
  • To elucidate the role of heterogeneous signals and noise in SAN function.
  • To understand how stochastic resonance contributes to fail-safe operation in the heart's pacemaker.

Main Methods:

  • Perforated-patch recordings of membrane potential and Ca signals in rabbit SAN cells subjected to controlled noise currents.
  • Imaging of Ca signals in intact mouse SAN tissue.
  • Multiscale computational modeling (subcellular, cellular, and tissue levels) to simulate SAN function.

Main Results:

  • Noise currents were found to restore firing in dormant SAN cells and improve the rate and rhythm of irregularly firing cells, demonstrating stochastic resonance.
  • A resonance spectrum was identified, showing SAN cells' ability to respond to specific frequency components within noise.
  • Cholinergic stimulation was observed to shift the resonance spectrum towards lower frequencies, enhancing processing of slower signals.

Conclusions:

  • Sinoatrial node cells harness stochastic resonance, amplified by coupled electrical and Ca signaling, to ensure rhythmic heartbeat initiation, particularly at low rates.
  • This mechanism provides a novel explanation for how the heart avoids sinus arrest during conditions like parasympathetic stimulation, bradyarrhythmia, or aging.
  • The findings reveal a new signaling pathway crucial for maintaining cardiac rhythm under physiological stress.