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Related Concept Videos

Classification of Skeletal Muscle Fibers01:48

Classification of Skeletal Muscle Fibers

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Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
Slow-Twitch Muscle Fibers
Slow oxidative, muscle fibers appear red due to large numbers of capillaries and high levels of...
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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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Relaxation of Skeletal Muscles01:29

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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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The Functions of the Skeletal System01:22

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The most apparent functions of the skeletal system are support, protection, and movement. However, bone tissue also performs several other critical metabolic functions. For one, the bone matrix acts as a reservoir for a number of minerals important to the functioning of the body, especially calcium and phosphorus. These minerals, present in the bone tissue, can be released back into the bloodstream when required. Calcium ions, for example, are essential for muscle contractions and controlling...
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Disorders of the Skeletal Muscle01:28

Disorders of the Skeletal Muscle

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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...
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Naming Skeletal Muscles01:19

Naming Skeletal Muscles

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The naming of the approximately 700 muscles in the human body is based on a set of criteria designed to provide descriptive information about each muscle, making it easier to identify and remember them.
The key factors used in naming muscles include:
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Related Experiment Video

Updated: Feb 15, 2026

Application of Chronic Stimulation to Study Contractile Activity-induced Rat Skeletal Muscle Phenotypic Adaptations
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Application of Chronic Stimulation to Study Contractile Activity-induced Rat Skeletal Muscle Phenotypic Adaptations

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Integrated study on comparative transcriptome and skeletal muscle function in aged rats.

Jing Zhou1, Zhiyin Liao1, Jinliang Chen1

  • 1Department of Geriatrics, The First Affiliated Hospital of Chongqing Medical University, Friendship Road 1, Yuan Jiagang, 400016, Chongqing, China.

Mechanisms of Ageing and Development
|January 13, 2018
PubMed
Summary

Aging impairs skeletal muscle function in rats, evidenced by reduced grip strength and muscle mass. Key gene expressions like IGF-1 and AMPK decrease, while MGMT and CHRNa1 increase, contributing to muscle aging.

Keywords:
Gene expressionGrip strengthRNA-Seq technologySarcopenia

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Area of Science:

  • Gerontology
  • Molecular Biology
  • Skeletal Muscle Physiology

Background:

  • Skeletal muscle aging is characterized by progressive loss of mass and function.
  • Understanding the molecular mechanisms underlying age-related muscle decline is crucial for developing interventions.

Purpose of the Study:

  • To investigate aging-related transcriptomic and physiological changes in rat skeletal muscle.
  • To identify key genes and pathways involved in age-associated muscle dysfunction.

Main Methods:

  • Comparative analysis of transcriptome sequencing between young (6-month-old) and old (25-month-old) Sprague-Dawley rats.
  • Assessment of physiological parameters including body mass, grip strength, and gastrocnemius muscle mass.
  • Gene Ontology (GO) enrichment and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis.

Main Results:

  • Old rats exhibited significantly lower muscle index and relative grip strength compared to young rats.
  • Down-regulation of genes associated with energy metabolism (AMPK), muscle growth (IGF-1), and structural integrity (collagen family).
  • Up-regulation of MGMT and CHRNa1, implicated in muscle wasting and weakness.

Conclusions:

  • Reduced expression of AMPK, IGF-1, and CASK contributes to age-related muscle mass and function loss.
  • Upregulation of MGMT and CHRNa1 are associated with muscle wasting and weakness during aging.
  • Transcriptomic insights provide a foundation for understanding and potentially mitigating skeletal muscle aging.