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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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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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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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Action Potential: Phases of Stimulation01:28

Action Potential: Phases of Stimulation

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The action potential is a complex electrical event that occurs in excitable cells, such as neurons and muscle cells. It consists of several distinct phases, each with specific characteristics.
Resting Phase:
In this phase, the cell's membrane is at its resting potential, typically around -70 millivolts (mV) for neurons. Inside the cell, there is a higher concentration of potassium ions (K+) and a lower concentration of sodium ions (Na+). Voltage-gated sodium channels are closed, and...
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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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Generation of Action Potential in Skeletal Muscles01:24

Generation of Action Potential in Skeletal Muscles

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Every cell in the body maintains a membrane potential due to an uneven distribution of positive and negative charges across its plasma membrane. The membrane potential is measured in millivolts and quantifies the difference in charge across the membrane.
Like neurons, muscle cells are also regarded as excitable due to their capacity to change in response to stimuli, primarily due to voltage-gated ion channels embedded in their plasma membranes, which get activated by alterations in the...
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Related Experiment Video

Updated: Oct 23, 2025

Contribution of the Na+/K+ Pump to Rhythmic Bursting, Explored with Modeling and Dynamic Clamp Analyses
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Contribution of the Na+/K+ Pump to Rhythmic Bursting, Explored with Modeling and Dynamic Clamp Analyses

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Excitable dynamics in neural and cardiac systems.

Roberto Barrio1, Stephen Coombes2, Mathieu Desroches3

  • 1IUMA and Applied Mathematics Department, University of Zaragoza, Zaragoza E-50009, Spain.

Communications in Nonlinear Science & Numerical Simulation
|August 23, 2021
PubMed
Summary

This special issue explores the growing synergy between math, physics, and engineering in medical research, focusing on cardiac and neural excitability. It presents 24 studies investigating brain and heart dynamics across various scales.

Keywords:
92BxxCardiac systemsExcitable dynamicsNeural systems

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Last Updated: Oct 23, 2025

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Area of Science:

  • Biomedical Engineering
  • Computational Neuroscience
  • Cardiac Electrophysiology

Background:

  • Interdisciplinary approaches integrating mathematics, physics, and engineering are crucial for advancing medical research.
  • Understanding complex physiological and pathophysiological phenomena in the brain and heart requires sophisticated analytical tools.

Purpose of the Study:

  • To showcase the synergy between engineering, physics, and mathematics in medical research.
  • To highlight recent advancements in understanding cardiac and neural excitability.

Main Methods:

  • The special issue features 24 original research papers.
  • Studies span diverse scales, from subcellular domains and isolated neurons to whole-organ dynamics.
  • Investigative approaches combine theoretical modeling, computational simulations, and experimental data analysis.

Main Results:

  • The collection demonstrates significant progress in elucidating the physiological and pathophysiological functions of the brain and heart.
  • Key findings address the dynamics of excitable systems in both neural and cardiac tissues.
  • The research spans a wide spectrum of complexity, offering insights into both fundamental mechanisms and clinical implications.

Conclusions:

  • The integration of quantitative sciences with biological and medical research offers powerful insights into complex systems.
  • Continued interdisciplinary collaboration is essential for future breakthroughs in disease prevention, diagnosis, and treatment.
  • This special issue underscores the importance of studying excitable dynamics for a comprehensive understanding of neural and cardiac function.