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Structure of Cardiac Muscles

Structure of Cardiac Muscles

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...

Specialized Characteristics of Cardiac Muscles

Specialized Characteristics of Cardiac Muscles

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...

Fascicle Arrangement in Skeletal Muscles

Fascicle Arrangement in Skeletal Muscles

Fascicles are bundles of muscle fibers in a skeletal muscle. Muscle fascicle arrangement is directly associated with the power and range of motion of various muscles. The configuration of these fascicles can vary, leading to different functional outcomes.
The four primary types of muscle based on fascicle arrangement are:

Cardiac Action Potential

Cardiac Action Potential

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

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.

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...

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Related Experiment Video

Updated: Apr 1, 2026

Patient-specific Modeling of the Heart: Estimation of Ventricular Fiber Orientations

Patient-specific Modeling of the Heart: Estimation of Ventricular Fiber Orientations

Published on: January 8, 2013

Ventricular fiber optimization utilizing the branching structure.

Takumi Washio¹, Kazunori Yoneda², Jun-Ichi Okada¹

¹Graduate School of Frontier Sciences, The University of Tokyo, 178-4 Wakashiba, Kashiwa, Chiba, 277-0871, Japan.

International Journal for Numerical Methods in Biomedical Engineering

|October 11, 2015

Summary

This study optimizes human heart ventricular fiber structure using a novel algorithm. Impulse optimization improves pumping performance and aligns with experimental data, offering a robust method for cardiac modeling.

Keywords:

branching structure fiber orientation finite element method heart optimization pumping performance

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Last Updated: Apr 1, 2026

Patient-specific Modeling of the Heart: Estimation of Ventricular Fiber Orientations

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Published on: January 8, 2013

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing

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Published on: December 11, 2017

Reduction in Left Ventricular Wall Stress and Improvement in Function in Failing Hearts using Algisyl-LVR

Reduction in Left Ventricular Wall Stress and Improvement in Function in Failing Hearts using Algisyl-LVR

Published on: April 8, 2013

Area of Science:

Biomedical Engineering
Computational Biology
Cardiovascular Research

Background:

Human heart's myocardial fibers exhibit complex helical structures, transitioning from right-handed at the endocardium to left-handed at the epicardium.
This intricate fiber architecture is crucial for the heart's remarkable pumping efficiency.

Purpose of the Study:

To develop and evaluate an algorithm for optimizing ventricular myocardial fiber structure.
To investigate how different optimization strategies impact cardiac function and mechanical properties.

Main Methods:

Macroscopic modeling of cardiac myocyte branching within a finite element ventricular model.
Simulating heartbeats with multidirectional fibers and updating central fiber orientation via workload or impulse optimization.
Comparing optimization outcomes against experimental data on fiber helix angle and strain.

Main Results:

Both workload and impulse optimization processes enhanced ventricular pumping performance.
Impulse optimization demonstrated superior agreement with experimental findings on transmural fiber helix angles and strain patterns.
Impulse optimization proved robust to geometric variations and homogenized mechanical factors.

Conclusions:

The proposed impulse optimization algorithm effectively refines ventricular fiber structure for improved cardiac function.
This computational approach offers a robust and experimentally validated method for understanding and modeling cardiac mechanics.