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Related Concept Videos

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...
The Proteasome02:18

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
Bone Disorders01:29

Bone Disorders

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.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
Parkinson Disease ll: Pathophysiology01:24

Parkinson Disease ll: Pathophysiology

Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...
COPD: Pathogenesis and Clinical Features01:20

COPD: Pathogenesis and Clinical Features

Chronic obstructive pulmonary disease (COPD) is a group of lung conditions that progressively worsen over time, including chronic bronchitis and emphysema. This cluster of diseases collectively leads to a gradual and irreversible decline in lung function over time.
The primary cause for the onset of COPD is cigarette smoking and exposure to air pollution. These hazardous factors initiate a chain reaction within the lungs, resulting in chronic inflammation, damage to the airways, and a...
The Functions of the Skeletal System01:22

The Functions of the Skeletal System

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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Related Experiment Video

Updated: May 30, 2026

The Creation of a Rat Model for Osteosarcopenia via Ovariectomy
03:52

The Creation of a Rat Model for Osteosarcopenia via Ovariectomy

Published on: February 21, 2025

Sarcopenia - pathophysiology and clinical relevance.

Michael Drey1

  • 1Institute for Biomedicine of Aging, University of Erlangen-Nürnberg, Nürnberg, Germany. michael.drey@gmx.de

Wiener Medizinische Wochenschrift (1946)
|July 28, 2011
PubMed
Summary

Sarcopenia, an age-related muscle loss, stems from multiple factors including mitochondrial dysfunction, reduced motor units, hormonal changes, and lifestyle. This condition significantly impacts independence and increases healthcare costs.

Related Experiment Videos

Last Updated: May 30, 2026

The Creation of a Rat Model for Osteosarcopenia via Ovariectomy
03:52

The Creation of a Rat Model for Osteosarcopenia via Ovariectomy

Published on: February 21, 2025

Area of Science:

  • Gerontology
  • Muscle Physiology
  • Cellular Biology

Background:

  • Sarcopenia is a multifactorial condition characterized by the progressive loss of skeletal muscle mass and strength.
  • Age-associated changes in muscle fibers, mitochondria, and motor units contribute to sarcopenia.
  • Hormonal imbalances, inflammation, and lifestyle factors like physical activity and nutrition exacerbate muscle loss in older adults.

Purpose of the Study:

  • To comprehensively review the multidimensional causes of sarcopenia.
  • To elucidate the cellular and systemic mechanisms underlying age-related muscle decline.
  • To highlight the clinical and economic consequences of sarcopenia.

Main Methods:

  • Literature review of studies on sarcopenia.
  • Analysis of age-related changes at the muscle fiber, cellular, and systemic levels.
  • Examination of the impact of hormonal, inflammatory, and lifestyle factors.

Main Results:

  • Fast-twitch muscle fibers are preferentially lost, leading to significant muscle power reduction.
  • Mitochondrial dysfunction and reduced motor units contribute to muscle atrophy and weakness.
  • Low anabolic hormones, cytokine imbalance, low physical activity, vitamin D, and protein intake are strongly linked to sarcopenia.

Conclusions:

  • Sarcopenia results from a complex interplay of biological aging and environmental factors.
  • The condition leads to loss of independence and substantial healthcare burdens.
  • Understanding these multidimensional causes is crucial for developing effective interventions.