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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.
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Microscopic Anatomy of Skeletal Muscles01:13

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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.
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Actin and Myosin in Muscle Contraction01:16

Actin and Myosin in Muscle Contraction

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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...
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Formation of Muscle Fibers from Myoblasts01:13

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De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
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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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Overview of Skeletal Muscle01:15

Overview of Skeletal Muscle

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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,...
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Updated: Sep 16, 2025

Real Time and Repeated Measurement of Skeletal Muscle Growth in Individual Live Zebrafish Subjected to Altered Electrical Activity
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Muscle growth by sarcomere divisions.

Clement Rodier1, Ian D Estabrook2, Eunice HoYee Chan1

  • 1CNRS, IBDM, Turing Centre for Living Systems, Aix Marseille University, Marseille, France.

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|July 9, 2025
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Summary
This summary is machine-generated.

Individual sarcomeres divide to form new sarcomeres, enabling muscle growth and repair during development. This process ensures muscle cells maintain mechanical integrity as the skeleton grows.

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Area of Science:

  • Muscle biology
  • Developmental biology
  • Cellular mechanics

Background:

  • Sarcomeres are the fundamental contractile units of muscle.
  • Muscle cells grow by increasing length, requiring new sarcomeres.
  • The mechanism of sarcomere addition during development was previously unknown.

Purpose of the Study:

  • To investigate how muscles add new sarcomeres to facilitate growth.
  • To understand the process of sarcomere addition during Drosophila development.

Main Methods:

  • Live imaging of sarcomere components in developing Drosophila.
  • High-throughput image analysis to track sarcomere dynamics.

Main Results:

  • Individual sarcomeres divide along the myofibril tension axis into daughter sarcomeres.
  • New sarcomeres are inserted into myofibrils, maintaining mechanical integrity.
  • Sarcomere division appears to be triggered by tension and local damage.

Conclusions:

  • Sarcomere division is a novel mechanism for muscle growth during development.
  • This process repairs damaged sarcomeres and synchronizes muscle growth with skeletal growth.