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Related Concept Videos

The Sarcomere01:08

The Sarcomere

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 myosin...
Actin and Myosin in Muscle Contraction01:16

Actin and Myosin in Muscle Contraction

Actin and myosin are contractile proteins that form the sarcomere found in skeletal muscle tissues for regulating muscle contraction. Actin, a globular contractile protein, interacts with myosin for muscle contraction. The skeletal tissue appears striped or striated under a microscope due to the repeated arrangement of contractile proteins actin and myosin along the length of myofibrils. Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes...
Microscopic Anatomy of Skeletal Muscles01:13

Microscopic Anatomy of Skeletal Muscles

Skeletal muscle cells, also called muscle fibers, are distinctly elongated, multi-nucleated, slender biological units. They are packed with specialized structures designed to facilitate their primary function, which is contraction.
The muscle sarcolemma is a plasma membrane enclosing each muscle cell that conducts electrical signals called action potentials. The sarcolemma extends into the cell to form T-tubules, ensuring the neural impulses are uniformly distributed across the entire muscle...
The Role of Actin and Myosin in Non-muscle Cells01:10

The Role of Actin and Myosin in Non-muscle Cells

Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They  are held...
Overview of Skeletal Muscle01:15

Overview of Skeletal Muscle

Skeletal muscles are composed of a bundle of muscle fibers and are attached to bones through tendons. Each skeletal muscle fiber is a single muscle cell. The sarcolemma, the plasma membrane of a skeletal muscle cell, consists of a lipid bilayer and glycocalyx that supports muscle fibers. The sarcolemma extends into the muscle cells to form tubular structures called transverse or T-tubules. Each side of the T-tubules consists of a membrane-bound structure called the sarcoplasmic reticulum,...
Excitation-Contraction Coupling in Skeletal Muscles01:20

Excitation-Contraction Coupling in Skeletal Muscles

Excitation-contraction coupling is a series of events that occur between generating an action potential and initiating a muscle contraction. It occurs at the triad, a structure found in skeletal muscle fibers that comprise a T-tubule and terminal cisternae of the sarcoplasmic reticulum on each side. These triads are visible in longitudinally sectioned muscle fibers. They are typically located at the A-I junction — the junction between the A and I bands of the sarcomere.
When an action potential...

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Related Experiment Video

Updated: Jun 5, 2026

Sarcomere Shortening of Pluripotent Stem Cell-Derived Cardiomyocytes using Fluorescent-Tagged Sarcomere Proteins.
08:37

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

Published on: March 3, 2021

The sarcomeric cytoskeleton: who picks up the strain?

Mathias Gautel1

  • 1King's College London BHF Centre of Research Excellence, Cardiovascular Division and Randall Division for Cell and Molecular Biophysics, London SE1 1UL, United Kingdom. mathias.gautel@kcl.ac.uk

Current Opinion in Cell Biology
|December 31, 2010
PubMed
Summary

The sarcomeric cytoskeleton, including proteins like titin and nebulin, organizes muscle structure and function. Emerging research reveals how these proteins handle mechanical stress and transmit signals within muscle cells.

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Isolating Myofibrils from Skeletal Muscle Biopsies and Determining Contractile Function with a Nano-Newton Resolution Force Transducer
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Isolating Myofibrils from Skeletal Muscle Biopsies and Determining Contractile Function with a Nano-Newton Resolution Force Transducer

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Aip1p Dynamics Are Altered by the R256H Mutation in Actin
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Aip1p Dynamics Are Altered by the R256H Mutation in Actin

Published on: July 30, 2014

Related Experiment Videos

Last Updated: Jun 5, 2026

Sarcomere Shortening of Pluripotent Stem Cell-Derived Cardiomyocytes using Fluorescent-Tagged Sarcomere Proteins.
08:37

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

Published on: March 3, 2021

Isolating Myofibrils from Skeletal Muscle Biopsies and Determining Contractile Function with a Nano-Newton Resolution Force Transducer
07:55

Isolating Myofibrils from Skeletal Muscle Biopsies and Determining Contractile Function with a Nano-Newton Resolution Force Transducer

Published on: May 7, 2020

Aip1p Dynamics Are Altered by the R256H Mutation in Actin
08:57

Aip1p Dynamics Are Altered by the R256H Mutation in Actin

Published on: July 30, 2014

Area of Science:

  • Muscle physiology
  • Cellular biomechanics
  • Cytoskeletal protein research

Background:

  • Striated muscle sarcomeres rely on a specialized cytoskeleton for organization.
  • Key components include actin, myosin, and giant proteins like titin, obscurin, and nebulin.
  • These proteins possess architectural, mechanical, and signaling functions.

Purpose of the Study:

  • To elucidate the roles of sarcomeric cytoskeleton proteins in mechanical strain and signaling.
  • To understand the interdependence of mechanics and signaling within the sarcomere.
  • To gain insights into the structure, interactions, and mechanical stability of these protein complexes.

Main Methods:

  • Analysis of sarcomeric protein complexes.
  • Investigation of cytoskeletal protein interactions and structure.
  • Assessment of mechanical stability and signaling roles.

Main Results:

  • Recent studies have shed light on the specific contributions of sarcomeric cytoskeleton proteins.
  • Understanding of protein complex interactions, structure, and mechanical stability has advanced.
  • Insights into the dual structural and signaling roles of these proteins are emerging.

Conclusions:

  • The sarcomeric cytoskeleton is crucial for muscle function, integrating mechanical and signaling pathways.
  • Further research is uncovering the detailed mechanisms by which these proteins contribute to muscle mechanics and signaling.
  • The sarcomere serves as a model system for understanding specialized actomyosin networks.