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Related Concept Videos

Cross-bridge Cycle01:26

Cross-bridge Cycle

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.
Smooth Muscle Contraction01:25

Smooth Muscle Contraction

Smooth muscle contraction is a complex process vital for various bodily functions, from maintaining blood vessel tension to facilitating the movement of food through the digestive tract. Unlike striated muscles, smooth muscle contraction begins more slowly and lasts longer.
The onset of contraction is triggered by an increase in calcium ions within the sarcoplasm, similar to the process in striated muscle. However, smooth muscles have a relatively smaller reservoir of the sarcoplasmic...
Isotonic and Isometric Muscle Contractions01:22

Isotonic and Isometric Muscle Contractions

Two primary types of muscle contractions are isotonic and isometric, each serving unique functions and involving distinct mechanisms. Both isotonic and isometric contractions are integral to the body's complex system of movement and stability. Isotonic exercises contribute significantly to functional strength and movement, while isometric contractions are crucial for maintaining posture and joint stability.
Isotonic contractions
Isotonic contractions occur when a muscle changes length while the...
Overview of Skeletal Muscle01:15

Overview of Skeletal Muscle

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,...
Energy Supply for Muscle Contraction01:25

Energy Supply for Muscle Contraction

Skeletal muscle fibers have the unique ability to switch between rest and contraction states, using different sources of ATP for energy. The contraction cycle and Ca2+ transport back into the sarcoplasmic reticulum for relaxation require significant ATP. However, the ATP reserves in muscle fibers are limited and can only sustain contractions for a few seconds. Additional ATP production becomes necessary for prolonged contractions. As a result, muscle fibers generate ATP through various sources,...
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,...

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Related Experiment Video

Updated: May 17, 2026

Unfractionated Bulk Culture of Mouse Skeletal Muscle to Recapitulate Niche and Stem Cell Quiescence
06:11

Unfractionated Bulk Culture of Mouse Skeletal Muscle to Recapitulate Niche and Stem Cell Quiescence

Published on: June 2, 2023

Mechanisms for maintaining muscle.

Ambar Banerjee1, Denis C Guttridge

  • 1Department of Surgery, St. John Hospital and Medical Center, Detroit, Michigan, USA.

Current Opinion in Supportive and Palliative Care
|October 31, 2012
PubMed
Summary
This summary is machine-generated.

Muscle mass is maintained by balancing protein synthesis and degradation. This review details the complex pathways involved in muscle atrophy and hypertrophy, crucial for maintaining homeostasis.

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Last Updated: May 17, 2026

Unfractionated Bulk Culture of Mouse Skeletal Muscle to Recapitulate Niche and Stem Cell Quiescence
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Area of Science:

  • Muscle physiology and molecular biology.

Background:

  • Muscle mass is regulated by the dynamic balance between protein synthesis and degradation.
  • Dysregulation of this balance contributes to muscle atrophy and impacts overall health.

Purpose of the Study:

  • To review the latest scientific understanding of the pathways governing muscle mass.
  • To highlight the interplay between anabolic and catabolic processes in muscle homeostasis.

Main Methods:

  • This review synthesizes current research on muscle protein metabolism.
  • Key pathways including IGF-1/PI3K/Akt, ubiquitin-proteasome, lysosomal/autophagy, and myostatin are discussed.

Main Results:

  • Muscle homeostasis is maintained by interconnected anabolic and catabolic pathways.
  • The insulin-like growth factor 1/IRS1/PI3K/Akt pathway plays a significant role.
  • Ubiquitin-proteasome, lysosomal/autophagy, and myostatin pathways are critical regulators.

Conclusions:

  • A holistic view of mediators controlling muscle gain and loss is presented.
  • Targeting these pathways offers potential for novel therapeutics.
  • Therapeutic interventions could improve mobility and quality of life in various clinical conditions.