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Related Concept Videos

Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

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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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Conduction System of the Heart01:19

Conduction System of the Heart

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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.
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...
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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.
This system relies on the unique properties of nodal and Purkinje cells:...
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Specialized Characteristics of Cardiac Muscles01:27

Specialized Characteristics of Cardiac Muscles

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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...
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Cardiac Action Potential01:30

Cardiac Action Potential

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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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Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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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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Updated: Mar 28, 2026

Generation of Murine Cardiac Pacemaker Cell Aggregates Based on ES-Cell-Programming in Combination with Myh6-Promoter-Selection
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Functiogenesis of cardiac pacemaker activity.

Tetsuro Sakai1, Kohtaro Kamino2

  • 1Department of Systems Physiology, University of the Ryukyus Graduate School of Medicine, 207 Uehara, Nishihara, Okinawa, 903-0215, Japan. tsakai@med.u-ryukyu.ac.jp.

The Journal of Physiological Sciences : JPS
|January 1, 2016
PubMed
Summary

Researchers explored early embryonic chick heart development, introducing "functiogenesis" to describe functional organization alongside structural "morphogenesis." This study details the framework of functiogenesis, emphasizing cardiac pacemaker function and its organized pacemaking area.

Keywords:
Cardiac pacemaker potentialEarly embryonic chick heartFunctiogenesisOptical techniquePacemaking areaVoltage-sensitive dye

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Area of Science:

  • Developmental biology
  • Electrophysiology
  • Cardiovascular research

Background:

  • Investigating the ontogenesis of electrophysiological events in early embryonic chick hearts.
  • Utilizing optical techniques and voltage-sensitive dyes to record membrane potential.

Purpose of the Study:

  • Introduce and define the novel concept of "functiogenesis" as a parallel to "morphogenesis" in embryonic development.
  • Describe the framework of functiogenesis.
  • Focus on cardiac pacemaker function and the functional organization of the pacemaking area.

Main Methods:

  • Optical recording of membrane potential.
  • Use of voltage-sensitive dyes.
  • Investigation of early embryonic chick hearts.

Main Results:

  • Established the concept of "functiogenesis" in relation to cardiac development.
  • Detailed the framework for understanding functional organization.
  • Characterized the cardiac pacemaker function and its organizational principles.

Conclusions:

  • Functiogenesis provides a framework for understanding the development of cardiac function.
  • Cardiac pacemaker function is a key aspect of early heart development.
  • Functional organization is integral to cardiac morphogenesis.