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Related Concept Videos

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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Classification of Skeletal Muscle Fibers01:48

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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

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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The Functions of the Skeletal System01:22

The Functions of the Skeletal System

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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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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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Updated: Feb 7, 2026

Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model
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STAT3 in Skeletal Muscle Function and Disorders.

Eleonora Guadagnin1, Davi Mázala2, Yi-Wen Chen3,4

  • 1Department of Orthopeadic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA. eguadagnin@bwh.harvard.edu.

International Journal of Molecular Sciences
|August 4, 2018
PubMed
Summary
This summary is machine-generated.

Signal transducer and activator of transcription 3 (STAT3) is crucial for skeletal muscle health, regulating mass, repair, and disease. Balancing STAT3 activation is key for therapeutic interventions in muscle disorders.

Keywords:
IL6STAT3TGFatrophyhypertrophymusclesatellite cells

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Area of Science:

  • Muscle physiology and regeneration
  • Molecular signaling pathways
  • Cellular biology

Background:

  • Signal transducer and activator of transcription 3 (STAT3) signaling is integral to skeletal muscle homeostasis.
  • Dysregulation of STAT3 is implicated in various muscle pathologies.

Purpose of the Study:

  • To review the role of STAT3 in skeletal muscle mass, repair, and disease.
  • To discuss upstream activators like IL-6 and TGF-β1.
  • To explore the dual effects of STAT3 activation in muscle.

Main Methods:

  • Literature review of STAT3 signaling in skeletal muscle.
  • Analysis of STAT3's role in satellite cell function.
  • Examination of STAT3's impact on muscle hypertrophy and wasting.

Main Results:

  • STAT3 regulates satellite cell self-renewal, proliferation, and differentiation.
  • STAT3 activation promotes muscle hypertrophy but prolonged activation causes wasting.
  • STAT3 signaling in other organs impacts skeletal muscle health.

Conclusions:

  • STAT3 is a critical regulator of muscle regeneration and a potential therapeutic target.
  • Careful modulation of STAT3 activation duration, extent, and location is necessary for treating muscle diseases.
  • STAT3's complex role necessitates a balanced therapeutic approach.