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Related Concept Videos

Muscle Contraction01:15

Muscle Contraction

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 Coordination and Action01:24

Muscle Coordination and Action

Muscle coordination is a complex and finely tuned process essential for smooth and purposeful movements like flexion, extension, adduction, abduction, and rotation. The human body orchestrates the actions of various muscles working in concert, each with a specific role. Four functional types describe how muscles work together: agonist, antagonist, synergist, and fixator.
Agonists
Agonist muscles, often called prime movers, are the primary muscles responsible for producing a specific movement.
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...
Gross Anatomy of Skeletal Muscles01:12

Gross Anatomy of Skeletal Muscles

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,...
The Muscular System01:18

The Muscular System

The muscular system is essential to the body's overall structure and function, playing a crucial role in movement, stability, and internal processes. It consists of three distinct types of muscle tissue: the skeletal, the smooth, and the cardiac muscles.

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Updated: Jun 17, 2026

Skeletal Muscle Gender Dimorphism from Proteomics
09:29

Skeletal Muscle Gender Dimorphism from Proteomics

Published on: December 14, 2011

Muscle in defense.

Adam Lightfoot1, Anne McArdle, Richard D Griffiths

  • 1School of Clinical Science, University of Liverpool, Liverpool, UK.

Critical Care Medicine
|January 5, 2010
PubMed
Summary
This summary is machine-generated.

Critically ill patients experience physical inactivity, compromising skeletal muscle function. This muscle actively participates in defense against inflammation and regulates metabolism, not merely acting as a passive bystander.

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Area of Science:

  • Critical care medicine
  • Muscle physiology
  • Immunology

Background:

  • Physical inactivity in critically ill patients significantly impairs skeletal muscle function.
  • Immobile skeletal muscle plays an active role in the disease process, challenging the bystander concept.
  • Skeletal muscle possesses defense mechanisms against inflammation, including heat shock proteins and myokine production.

Purpose of the Study:

  • To elucidate the multifaceted role of skeletal muscle in critically ill patients.
  • To investigate skeletal muscle's involvement in inflammatory signaling and metabolic regulation.
  • To highlight skeletal muscle's contribution beyond immobility.

Main Methods:

  • Review of existing literature on skeletal muscle physiology in critical illness.
  • Analysis of inflammatory pathways involving skeletal muscle.
  • Examination of metabolic functions of skeletal muscle, including nutrient provision.

Main Results:

  • Skeletal muscle actively modulates systemic inflammation through a bidirectional signaling role.
  • Heat shock proteins and myokines are key components of skeletal muscle's inflammatory defense.
  • Skeletal muscle is crucial for whole-body glucose and protein metabolism, supplying nutrients like glutamine.

Conclusions:

  • Skeletal muscle is an active participant, not a passive bystander, in critical illness.
  • Understanding skeletal muscle's immune and metabolic roles is vital for managing critically ill patients.
  • Targeting skeletal muscle function may offer therapeutic benefits in critical care settings.