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Related Concept Videos

Conduction System of the Heart01:20

Conduction System of the Heart

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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.
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Conduction System of the Heart01:19

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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.
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The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
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Development of the Heart01:27

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The development of the human heart, a crucial organ, commences from the mesoderm on the 18th or 19th day after fertilization. This process initiates in the cardiogenic area, a group of mesodermal cells at the embryo's head end, which evolves into elongated strands known as cardiogenic cords. These cords undergo a transformation to form hollow-centered endocardial tubes.
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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.
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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...
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Related Experiment Video

Updated: Nov 4, 2025

Whole-Mount Immunofluorescence Staining, Confocal Imaging and 3D Reconstruction of the Sinoatrial and Atrioventricular Node in the Mouse
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Recognition of the atrioventricular node anatomical structure: Connection between the retroaortic node and the

Fan Wang1,2, Lu Lu Zhang1, Wei Meng1

  • 1Department of Cardiology, The 2nd Affiliated Hospital of Harbin Medical University, Harbin, China.

Journal of Cardiovascular Electrophysiology
|May 30, 2021
PubMed
Summary

The retroaortic node (RN) connects to the atrioventricular node (AVN), potentially forming a fast pathway for electrical conduction. This finding clarifies AVN anatomy and its role in tachycardia.

Keywords:
anatomyatrioventricular nodeconnexinsnode extensionreentry

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High-resolution Optical Mapping of the Mouse Sino-atrial Node
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High-resolution Optical Mapping of the Mouse Sino-atrial Node
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Area of Science:

  • Cardiac Electrophysiology
  • Cardiovascular Anatomy
  • Molecular Cardiology

Background:

  • The atrioventricular node (AVN) governs cardiac electrical conduction.
  • Its complex electrophysiology is linked to intricate anatomical structures.
  • Other node-like tissues, like the retroaortic node (RN), are less understood.

Purpose of the Study:

  • To investigate the anatomical and molecular characteristics of the retroaortic node (RN).
  • To clarify the relationship between the RN and the atrioventricular node (AVN).
  • To explore the potential role of the RN in cardiac conduction and arrhythmias.

Main Methods:

  • High-density tissue sections of the AVN from rats and rabbits.
  • Immunohistochemical labeling for connexins (Cx43, Cx40, Cx45) and ion channels (Nav 1.5, Cav 3.1, HCN4).
  • Masson's trichrome staining for fibrosis analysis.
  • Three-dimensional (3D) reconstruction of the AV junction.

Main Results:

  • The RN shares connexin isoforms with the compact node (CN) and inferior nodal extension (INE).
  • RN exhibits expression of Cav 3.1 and HCN4, with low Nav 1.5 levels.
  • RN connects to the CN and is the sole atrial connection in the anterior septum.

Conclusions:

  • The RN's anatomical connection to the AVN suggests direct electrical conduction.
  • The RN may function as the fast pathway for the AVN, influencing conduction velocity.
  • Understanding the RN's role is crucial for comprehending AVN function and re-entrant tachycardia mechanisms.