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Related Concept Videos

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 Protein Metabolism01:21

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Proteins are broken down into amino acids during digestion. Unlike fats and carbohydrates, which are stored for later use, proteins are not. Instead, amino acids are either used to produce ATP through oxidation or contribute to the creation of new proteins for the growth and repair of the body. Any surplus amino acids from the diet are converted into glucose or triglycerides rather than excreted.
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Bone Disorders01:29

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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
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Changes in the Appendicular Skeleton with Age01:09

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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
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Metabolic States of the Body: Fasting and Starvation01:24

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During the initial hours of fasting, the body uses up its glycogen stores as an energy source. Once these glycogen reserves are depleted, the body begins breaking down stored triglycerides and structural proteins. During this stage, glycerol becomes a key substrate for gluconeogenesis, while free fatty acids undergo beta-oxidation to provide energy for tissues, such as skeletal muscle. In the fasting state, the body spares protein breakdown as much as possible to conserve muscle and structural...
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Disorders of the Skeletal Muscle01:28

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The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
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Related Experiment Video

Updated: Sep 21, 2025

The Creation of a Rat Model for Osteosarcopenia via Ovariectomy
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Skeletal Muscle Metabolic Alternation Develops Sarcopenia.

Qiumei Yang1,2, Piu Chan1,3,4,2

  • 11Department of Neurology, Geriatrics and Neurobiology, National Clinical Research Center of Geriatric Disorders, Xuanwu Hospital of Capital Medical University, Beijing, China.

Aging and Disease
|June 3, 2022
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Sarcopenia, a condition of age-related muscle loss, is linked to metabolic changes. Understanding skeletal muscle metabolism is key to addressing this health threat in the elderly.

Keywords:
Sarcopeniametabolic alternationregenerationsignaling pathways

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Area of Science:

  • Gerontology
  • Muscle Physiology
  • Metabolic Research

Background:

  • Sarcopenia is characterized by progressive loss of skeletal muscle mass, strength, and function with aging.
  • It poses a significant health risk to the elderly, increasing healthcare burdens.
  • The exact mechanisms driving sarcopenia remain incompletely understood.

Purpose of the Study:

  • To review recent findings on skeletal muscle metabolic alterations in sarcopenia.
  • To explore the role of the muscle metabolic microenvironment in satellite cell regulation.
  • To enhance understanding and inform potential treatments for sarcopenia.

Main Methods:

  • Literature review of recent studies on sarcopenia and skeletal muscle metabolism.
  • Analysis of the relationship between metabolic changes and muscle mass/regeneration.
  • Focus on the impact of the metabolic microenvironment on satellite cells.

Main Results:

  • Skeletal muscle metabolic changes are identified as risk factors for sarcopenia.
  • The muscle metabolic microenvironment plays a crucial role in regulating satellite cells.
  • Metabolism is intrinsically linked to the control of muscle mass and regeneration.

Conclusions:

  • Altered skeletal muscle metabolism is a significant factor in sarcopenia development.
  • Targeting the muscle metabolic microenvironment may offer therapeutic strategies.
  • Further research into metabolic pathways is essential for sarcopenia treatment.