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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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Overview of Skeletal Muscle01:15

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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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Cross-bridge Cycle01:26

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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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Skeletal Muscle Anatomy00:55

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Skeletal muscle is the most abundant type of muscle in the body. Tendons are the connective tissue that attaches skeletal muscle to bones. Skeletal muscles pull on tendons, which in turn pull on bones to carry out voluntary movements.
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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.
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...
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Gross Anatomy of Skeletal Muscles01:12

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The connective tissues play a significant role in arranging the muscle fibers into a hierarchical structure that forms a complete muscle. Consider a muscle like the bicep brachii, commonly called the bicep. This muscle comprises thousands of muscle fibers enclosed by a protective layer of connective tissue called the endomysium. The endomysium is primarily composed of reticular fibers, a type of thin collagen fiber. It allows the exchange of nutrients and waste products at the fiber level,...
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Non-invasive Skeletal Muscle Quantification in Small Animals Using Micro-computed Tomography
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Atrofia del músculo esquelético

Leslie M Baehr1, David C Hughes1, David S Waddell2

  • 1University of Iowa, Iowa City, IA 52242, USA.

Cell
|April 29, 2022
PubMed
Resumen

El tamaño del músculo esquelético cambia con los estímulos, lo que implica la síntesis de proteínas y las vías de degradación. Comprender estas vías es clave para abordar la atrofia muscular y mantener la masa muscular.

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Área de la Ciencia:

  • Fisiología
  • Biología molecular
  • Biología celular

Sus antecedentes:

  • El músculo esquelético exhibe una plasticidad significativa, respondiendo dinámicamente a varios estímulos internos y externos.
  • El tamaño del músculo está regulado por una compleja interacción de procesos de síntesis y degradación de proteínas.
  • La desregulación de estos procesos subyace a la atrofia muscular, una condición con implicaciones significativas para la salud.

Objetivo del estudio:

  • Para aclarar las vías de señalización que rigen el tamaño del músculo esquelético.
  • Para entender cómo diferentes estímulos modulan la síntesis y degradación de proteínas.
  • Proporcionar una base para intervenciones dirigidas a la regulación de la masa muscular.

Principales métodos:

  • Revisión de la literatura actual sobre la señalización del músculo esquelético.
  • Análisis de las vías moleculares clave involucradas en el equilibrio de las proteínas musculares.
  • Integración de datos de varios estímulos que afectan el tamaño del músculo.

Principales resultados:

  • Identificó múltiples vías de señalización cruciales para regular la síntesis y degradación de proteínas musculares.
  • Se ha demostrado que estímulos específicos activan o inhiben diferencialmente estas vías.
  • Destacó la plasticidad del músculo esquelético en respuesta a las señales ambientales y fisiológicas.

Conclusiones:

  • El tamaño del músculo esquelético es un rasgo dinámico controlado por redes de señalización adaptables.
  • Los estímulos alterados conducen a cambios específicos en la señalización, afectando la rotación de proteínas musculares.
  • Las investigaciones adicionales sobre estas vías pueden informar estrategias para manejar las condiciones de desgaste muscular.