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Related Concept Videos

The Sarcomere01:08

The Sarcomere

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A sarcomere is a microscopic segment repeating in a myofibril. The sarcomere fundamentally consists of two main myofilaments: thick filaments called myosin and thin filaments called actin. These filaments interact by sliding past each other in response to stimulus. In addition to myosin and actin, several other proteins, such as tropomyosin, troponin, titin, nebulin, myomesin, α-actinin, and dystrophin, play crucial roles in regulating, structuring, and functioning of the sarcomere.
Each...
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Relaxation of Skeletal Muscles01:29

Relaxation of Skeletal Muscles

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The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open....
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Cross-bridge Cycle01:26

Cross-bridge Cycle

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As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.
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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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Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

Cardiomyopathy III: Hypertrophic Cardiomyopathy

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Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
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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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Updated: Sep 22, 2025

Sarcomere Shortening of Pluripotent Stem Cell-Derived Cardiomyocytes using Fluorescent-Tagged Sarcomere Proteins.
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Sarcomere Shortening of Pluripotent Stem Cell-Derived Cardiomyocytes using Fluorescent-Tagged Sarcomere Proteins.

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Dysfunctional sarcomeric relaxation in the heart.

Walter E Knight1, Kathleen C Woulfe1

  • 1Division of Cardiology, Department of Medicine, University of Colorado Anschutz Medical Campus, 12700 E 19 Ave, Aurora, CO 80045.

Current Opinion in Physiology
|May 23, 2022
PubMed
Summary
This summary is machine-generated.

Impaired cardiac relaxation in heart failure is often linked to sarcomeric protein dysfunction. Understanding these sarcomeric issues may reveal new therapeutic targets for diastolic dysfunction.

Keywords:
cardiaccross-bridge cyclingheart failure with preserved ejection fractionhypertrophic cardiomyopathyrelaxationrestrictive cardiomyopathysarcomere

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Area of Science:

  • Cardiology
  • Molecular Biology
  • Biochemistry

Background:

  • Cardiac relaxation is frequently impaired in heart failure across various etiologies.
  • Sarcomeric protein interactions are critical determinants of cardiac relaxation.
  • Diastolic dysfunction, a hallmark of heart failure, can stem from impaired sarcomeric relaxation.

Purpose of the Study:

  • To review the role of sarcomeric relaxation and dysfunction in heart failure.
  • To explore how alterations in sarcomeric protein interactions impact cardiac function.
  • To identify potential therapeutic targets for improving cardiac relaxation.

Main Methods:

  • Review of existing literature on sarcomeric protein function in cardiac relaxation.
  • Analysis of sarcomeric dysfunction in specific heart failure pathologies.
  • Focus on hypertrophic cardiomyopathy, restrictive cardiomyopathy, and heart failure with preserved ejection fraction.

Main Results:

  • Alterations in sarcomeric protein interactions significantly affect cardiac relaxation.
  • Sarcomeric dysfunction is implicated in the pathophysiology of multiple heart failure types.
  • Specific examples highlight the link between sarcomeric abnormalities and diastolic dysfunction.

Conclusions:

  • Sarcomeric dysfunction is a key contributor to impaired cardiac relaxation in heart failure.
  • Understanding sarcomeric physiology offers insights into diastolic dysfunction mechanisms.
  • Targeting sarcomeric proteins presents a promising therapeutic strategy for heart failure.