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Related Concept Videos

Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

2.7K
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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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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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:...
6.1K
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...
7.8K
Structure of Cardiac Muscles01:13

Structure of Cardiac Muscles

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Cardiac muscle, or myocardium, is a specialized type of muscle found exclusively in the heart. Its unique structural and functional characteristics enable the heart to perform its vital role of pumping blood throughout the body continuously and rhythmically. The cardiac muscle cells, or cardiomyocytes, possess an endomysium and perimysium but do not have an epimysium.
Compared to skeletal muscles, cardiac muscle cells are small and mostly have a single nucleus. Additionally, they are usually...
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Related Experiment Video

Updated: May 2, 2026

Impact of Intracardiac Neurons on Cardiac Electrophysiology and Arrhythmogenesis in an Ex Vivo Langendorff System
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Impact of Intracardiac Neurons on Cardiac Electrophysiology and Arrhythmogenesis in an Ex Vivo Langendorff System

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Nav-igating through a complex landscape: SCN10A and cardiac conduction.

David S Park, Glenn I Fishman

    The Journal of Clinical Investigation
    |March 20, 2014
    PubMed
    Summary

    Genome-wide association studies linked SCN10A to cardiac conduction. Researchers found SCN10A regulates SCN5A gene expression, not directly impacting heart rhythm.

    Area of Science:

    • Cardiovascular genetics
    • Molecular biology
    • Electrophysiology

    Background:

    • Genome-wide association studies (GWAS) implicated SCN10A in cardiac conduction.
    • SCN5A was traditionally considered the primary gene for cardiac conduction due to high cardiac expression.
    • SCN10A's role was hypothesized to be direct via cardiomyocytes or indirect via neurons.

    Purpose of the Study:

    • To investigate the precise role of SCN10A in cardiac conduction.
    • To determine if SCN10A directly affects cardiac function or influences other genes.
    • To clarify the interpretation of GWAS data concerning coding and non-coding genetic regions.

    Main Methods:

    • Analysis of SCN10A expression in human and murine heart tissue.
    • Identification and functional characterization of regulatory elements within the SCN10A locus.

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  • Assessing the impact of SCN10A locus elements on SCN5A gene expression in cardiomyocytes.

    • Main Results:

    • SCN10A expression was found to be negligible in human and murine hearts.
    • A T-box enhancer within the SCN10A locus was identified as a driver of SCN5A expression in cardiomyocytes.
    • This enhancer mechanism explains the GWAS findings linking SCN10A to cardiac conduction.

    Conclusions:

    • SCN5A, not SCN10A, is the key determinant of cardiac conduction.
    • The SCN10A locus functions as an enhancer for SCN5A gene expression.
    • Distinguishing between coding and non-coding GWAS signals is crucial for accurate genetic interpretation.