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Related Concept Videos

Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
Motor Unit Stimulation01:20

Motor Unit Stimulation

When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
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...
Muscle Contraction01:10

Muscle Contraction

In skeletal muscles, acetylcholine is released by nerve terminals at the motor endplate—the point of synaptic communication between motor neurons and muscle fibers. The binding of acetylcholine to its receptors on the sarcolemma allows entry of sodium ions into the cell and triggers an action potential in the muscle cell. Thus, electrical signals from the brain are transmitted to the muscle. Subsequently, the enzyme acetylcholinesterase breaks down acetylcholine to prevent excessive muscle...
Muscle Contraction01:15

Muscle Contraction

Exercise and Muscle Performance01:27

Exercise and Muscle Performance

Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...

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Related Experiment Video

Updated: Jun 20, 2026

The Muscle Cuff Regenerative Peripheral Nerve Interface for the Amplification of Intact Peripheral Nerve Signals
07:30

The Muscle Cuff Regenerative Peripheral Nerve Interface for the Amplification of Intact Peripheral Nerve Signals

Published on: January 13, 2022

Powerful signals for weak muscles.

Amarjit Saini1, Steve Faulkner, Nasser Al-Shanti

  • 1Institute for Biomedical Research into Human Movement and Health, Manchester Metropolitan University, Manchester, United Kingdom. a.saini@mmu.ac.uk

Ageing Research Reviews
|September 1, 2009
PubMed
Summary
This summary is machine-generated.

This review examines muscle growth and wasting mechanisms in aging sarcopenia and cancer cachexia. Understanding these pathways is key to developing treatments for muscle loss.

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Last Updated: Jun 20, 2026

The Muscle Cuff Regenerative Peripheral Nerve Interface for the Amplification of Intact Peripheral Nerve Signals
07:30

The Muscle Cuff Regenerative Peripheral Nerve Interface for the Amplification of Intact Peripheral Nerve Signals

Published on: January 13, 2022

Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles
14:02

Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles

Published on: November 1, 2012

Measuring the Strength of Mice
06:17

Measuring the Strength of Mice

Published on: June 2, 2013

Area of Science:

  • Muscle physiology
  • Cellular biology
  • Pathology

Background:

  • Sarcopenia involves age-related muscle mass and strength decline, impacting function.
  • Cancer cachexia is severe muscle wasting linked to disease states, characterized by weakness.
  • Muscle mass is regulated by a balance between protein synthesis (anabolism) and degradation (catabolism).

Purpose of the Study:

  • To review and critique mechanisms of skeletal muscle anabolic growth.
  • To evaluate catabolic processes in cancer cachexia and aging sarcopenia.
  • To identify therapeutic targets for muscle wasting conditions.

Main Methods:

  • Literature review and critical evaluation of existing studies.
  • Analysis of signaling networks coordinating muscle protein synthesis and degradation.
  • Comparison of metabolic pathways in aging and disease-related muscle loss.

Main Results:

  • Muscle wasting in aging and cancer shares common metabolic pathways.
  • Signaling networks intricately control muscle hypertrophy and atrophy.
  • Dysregulation of anabolic and catabolic processes leads to muscle loss.

Conclusions:

  • Understanding muscle growth and wasting pathways is crucial for therapeutic development.
  • Targeting these pathways offers promise for treating sarcopenia and cachexia.
  • Further research into the interaction of these pathways is essential.