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Related Concept Videos

Relaxation of Skeletal Muscles01:29

Relaxation of Skeletal Muscles

The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open.
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.
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,...
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,...
Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective response...
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: May 9, 2026

Myo-mechanical Analysis of Isolated Skeletal Muscle
08:42

Myo-mechanical Analysis of Isolated Skeletal Muscle

Published on: February 22, 2011

How tendons buffer energy dissipation by muscle.

Thomas J Roberts1, Nicolai Konow

  • 1Department of Ecology and Evolutionary Biology, Brown University, Providence, RI.

Exercise and Sport Sciences Reviews
|July 23, 2013
PubMed
Summary
This summary is machine-generated.

Muscles use active lengthening to dissipate energy, while tendons store and release elastic energy. This mechanism may protect muscles from damage during rapid movements.

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Engineering Tendon Assembloids to Probe Cellular Crosstalk in Disease and Repair
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Engineering Tendon Assembloids to Probe Cellular Crosstalk in Disease and Repair

Published on: March 22, 2024

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Last Updated: May 9, 2026

Myo-mechanical Analysis of Isolated Skeletal Muscle
08:42

Myo-mechanical Analysis of Isolated Skeletal Muscle

Published on: February 22, 2011

Engineering Tendon Assembloids to Probe Cellular Crosstalk in Disease and Repair
08:32

Engineering Tendon Assembloids to Probe Cellular Crosstalk in Disease and Repair

Published on: March 22, 2024

Area of Science:

  • Biomechanics
  • Muscle physiology
  • Sports science

Background:

  • Muscles dissipate energy through active lengthening during deceleration.
  • Tendons play a crucial role in energy management within the musculoskeletal system.

Purpose of the Study:

  • To elucidate the role of tendons in buffering muscle work during rapid energy dissipation.
  • To investigate the protective effects of the tendon's elastic mechanism on muscle damage.

Main Methods:

  • Analysis of muscle and tendon dynamics during high-energy dissipation events.
  • Modeling of elastic energy storage and release in tendons.

Main Results:

  • Tendons temporarily store elastic energy, buffering the work done on muscles.
  • Released elastic energy from tendons contributes to muscle work.
  • This mechanism reduces peak forces and lengthening rates experienced by active muscles.

Conclusions:

  • The elastic properties of tendons are vital for protecting muscles during rapid deceleration.
  • Tendons act as a shock absorber, mitigating muscle damage risk.
  • Understanding this mechanism has implications for injury prevention and performance enhancement.