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Related Concept Videos

Cross-bridge Cycle01:26

Cross-bridge Cycle

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.
Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective response...
Disorders of the Skeletal Muscle01:28

Disorders of the Skeletal Muscle

The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
Cellular Adaptation I: Introduction and Atrophy01:23

Cellular Adaptation I: Introduction and Atrophy

Cells can adapt to environmental changes to maintain function and avoid injury, a process called cellular adaptation. Adapted cells exist in a reversible intermediate state with changes in size, number, phenotype, metabolism, or function. These responses help cells meet altered physiological or pathological demands; for example, enlargement of breast and uterine tissues during pregnancy. Early adaptations may enhance function, but persistent stress eventually causes tissue damage.Types of...
Types of Skeletal Muscle Fibers01:32

Types of Skeletal Muscle Fibers

Skeletal muscles comprise various fibers, each with distinct characteristics and roles in movement and stability. They are mainly categorized into three types — fast-twitch, slow-twitch, and intermediate.
Fast-twitch fibers
Fast-twitch fibers, or Type II fibers, are designed for quick, powerful bursts of speed and strength. They reach peak tension within approximately 0.01 seconds following stimulation. Characterized by a large diameter and densely packed myofibrils, these fibers contain...
Relaxation of Skeletal Muscles01:29

Relaxation of Skeletal Muscles

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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Related Experiment Video

Updated: May 16, 2026

Tibial Nerve Transection - A Standardized Model for Denervation-induced Skeletal Muscle Atrophy in Mice
10:50

Tibial Nerve Transection - A Standardized Model for Denervation-induced Skeletal Muscle Atrophy in Mice

Published on: November 3, 2013

[Muscle fiber atrophy].

Ikuya Nonaka1

  • 1National Center of Neurology and Psychiatry.

Rinsho Shinkeigaku = Clinical Neurology
|December 1, 2012
PubMed
Summary

Microgravity causes significant atrophy in red soleus muscles, leading to fiber disorganization and mitochondrial loss. Recovery takes a month, with satellite cells not activated, highlighting the need for further research into muscle degeneration mechanisms.

Area of Science:

  • Muscle physiology and cellular biology.
  • Spaceflight biology and adaptation.
  • Biomedical research.

Context:

  • Skeletal muscles, particularly red (slow-twitch) fibers, are vital for maintaining posture against gravity.
  • Microgravity environments selectively impact red muscle fibers, leading to atrophy and degeneration.
  • Understanding these changes is crucial for astronaut health and potential therapeutic interventions.

Purpose:

  • To investigate the effects of unloading and microgravity on red muscle fiber structure and function.
  • To analyze the morphological changes, including atrophy, myofibril disorganization, and mitochondrial alterations in the soleus muscle.
  • To explore the regenerative capacity and cellular responses, such as satellite cell activation, following muscle unloading.

Summary:

More Related Videos

Immunolabelling Myofiber Degeneration in Muscle Biopsies
06:37

Immunolabelling Myofiber Degeneration in Muscle Biopsies

Published on: December 5, 2019

Related Experiment Videos

Last Updated: May 16, 2026

Tibial Nerve Transection - A Standardized Model for Denervation-induced Skeletal Muscle Atrophy in Mice
10:50

Tibial Nerve Transection - A Standardized Model for Denervation-induced Skeletal Muscle Atrophy in Mice

Published on: November 3, 2013

Immunolabelling Myofiber Degeneration in Muscle Biopsies
06:37

Immunolabelling Myofiber Degeneration in Muscle Biopsies

Published on: December 5, 2019

  • Hindlimb suspension in rats induced rapid soleus muscle atrophy (50% weight loss in 2 weeks) with myofibril disorganization and reduced mitochondria.
  • White muscle fibers within the soleus transformed into red fibers.
  • Morphological recovery took approximately one month, without satellite cell activation, suggesting alternative regeneration pathways or impaired repair mechanisms.

Impact:

  • This study reveals the severe impact of microgravity on antigravity muscles and identifies key pathological changes.
  • Findings underscore the need for further investigation into the mechanosensors and molecular pathways, like Cbl-b activation, involved in microgravity-induced muscle atrophy.
  • Results contribute to understanding muscle degeneration in disuse and immobility, informing countermeasures for spaceflight and terrestrial conditions.