Related Experiment Video

Updated: Aug 19, 2026

Isolation and Functional Characterization of Human Ventricular Cardiomyocytes from Fresh Surgical Samples
14:39

Isolation and Functional Characterization of Human Ventricular Cardiomyocytes from Fresh Surgical Samples

Published on: April 21, 2014

[The intermitochondrial contacts of cardiomyocytes during cardiac adaptation under pathological conditions]

V S Paukov, D D Protsenko

    Arkhiv Patologii
    |November 1, 1996
    PubMed

    Intermitochondrial junctions (IMJ)-recently described intracellular structures-were investigated in order to evaluate their role in pathology. Chronic and acute pathological processes including myocardial hypertrophy and its regression, chronic alcohol cardiomyopathy, acute pancreatitis and acute diffuse peritonitis were modelled in 106 male rats. The myocardial tissue was studied histologically, electron-microscopically and morphometrically. It is shown that myocardial hyperfunction morphology is due to the heart functional overload that requires its adequate energy supply. Therefore, apart from the mitochondrial hyperplasia, their association by means of IMJ occurs. IMJ number decreased in case of a heart overload reduction, and complete destruction of mitochondria and IMJ takes place in acute conditions leading to the animals' death of heart failure. The authors consider IMJ formation and destruction in pathology to be manifestation of the compensatory-adaptive reaction not described so far.

    More Related Videos

    Analysis of the Mitochondrial Density and Longitudinal Distribution in Rat Live-Skeletal Muscle Fibers by Confocal Microscopy10:53

    Analysis of the Mitochondrial Density and Longitudinal Distribution in Rat Live-Skeletal Muscle Fibers by Confocal Microscopy

    Published on: December 1, 2023

    Methods for In situ Quantification of Mitochondrial Morphology in Muscle and Terminal Schwann Cells of Mice08:13

    Methods for In situ Quantification of Mitochondrial Morphology in Muscle and Terminal Schwann Cells of Mice

    Published on: April 10, 2026

    Related Concept Videos

    The Inner Mitochondrial Membrane01:28

    The Inner Mitochondrial Membrane

    The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
    Structure of Cardiac Muscles01:13

    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 Muscles01:27

    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 reserves in...
    Pathophysiology of Cardiac Performance01:29

    Pathophysiology of Cardiac Performance

    Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
    Myocarditis I: Introduction01:21

    Myocarditis I: Introduction

    Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
    Cellular Adaptation II: Hypertrophy01:26

    Cellular Adaptation II: Hypertrophy

    Hypertrophy is the increase in the size of individual cells, resulting in the enlargement of a tissue or organ. Unlike hyperplasia, which involves an increase in cell number, hypertrophy is characterized by an increase in cell volume. This process often occurs in response to higher functional demand or hormonal stimulation, leading to the production of more structural proteins and organelles, thereby enhancing the cells' work capacity.There are two primary types of hypertrophy: physiological...