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Conduction System of the Heart

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:...

Conduction System of the Heart

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...

Chambers of the Heart

Chambers of the Heart

The human heart is a complex organ made up of four chambers: the right and left atria and the right and left ventricles. These internal chambers are separated by partitions known as the interatrial and interventricular septa. The exterior of the heart features a groove known as the coronary sulcus that demarcates the atria from the ventricles, while the anterior and posterior interventricular sulci distinguish between the two ventricles.
Deoxygenated blood from the body is received in the right...

Electrophysiology of Normal Cardiac Rhythm

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...

The Cardiac Cycle

The Cardiac Cycle

The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
The Process
Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and empty blood into the...

Mechanism of Cardiac Arrhythmias

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.

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Related Experiment Video

Updated: Jun 18, 2026

Isolation of Atrial Myocytes from Adult Mice

Isolation of Atrial Myocytes from Adult Mice

Published on: July 25, 2019

Concealed conduction effects in the atrium.

Jan J Zebrowski¹, Pawel Kuklik, Teodor Buchner

¹Physics of Complex Systems, Faculty of Physics, Warsaw University of Technology, Warszawa, ul. Koszykowa 75, Poland. zebra@if.pw.edu.pl

IEEE Engineering in Medicine and Biology Magazine : the Quarterly Magazine of the Engineering in Medicine & Biology Society

|November 17, 2009

Summary

This summary is machine-generated.

This study presents a 1-D computational model of the heart's atria and nodes, simulating electrical activity and heart rate variability. The model explains phenomena like RR-interval alternans and breathing effects on heart rate.

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Isolation of Atrial Myocytes from Adult Mice

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Published on: February 22, 2018

Area of Science:

Computational biology
Cardiac electrophysiology
Mathematical modeling

Background:

The sinoatrial (SA) and atrioventricular (AV) nodes, along with atrial tissue, govern heart rhythm.
Understanding their complex electrical interactions is crucial for diagnosing and treating cardiac arrhythmias.

Purpose of the Study:

To develop and validate a one-dimensional computational model of the atrium and its nodes.
To investigate the mechanisms underlying phenomena such as RR-interval alternans and heart rate variability.

Main Methods:

Modeled SA and AV nodes using modified van der Pol oscillator chains.
Represented atrium tissue with FitzHugh-Nagumo (FHN) equations.
Incorporated simplified autonomic nervous system activity and breathing modulation.

Main Results:

The model accurately reproduces physiological properties like refractory periods and action potential frequency changes.
Simulated conduction rates in nodes correlate with interspike intervals (ISIs), explaining RR-interval alternans.
Modeled breathing effects and concealed conduction, yielding results comparable to heart rate variability data.

Conclusions:

The developed 1-D model provides a valuable tool for studying cardiac electrophysiology and rhythm disturbances.
It offers insights into the mechanisms of RR-interval alternans and the impact of autonomic and respiratory influences on heart rate.