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Excitation-Contraction Coupling in Skeletal Muscles

Excitation-Contraction Coupling in Skeletal Muscles

Excitation-contraction coupling is a series of events that occur between generating an action potential and initiating a muscle contraction. It occurs at the triad, a structure found in skeletal muscle fibers that comprise a T-tubule and terminal cisternae of the sarcoplasmic reticulum on each side. These triads are visible in longitudinally sectioned muscle fibers. They are typically located at the A-I junction — the junction between the A and I bands of the sarcomere.
When an action potential...

Exercise and Muscle Performance

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...

Tension Response at Adherens Junctions

Tension Response at Adherens Junctions

The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...

Smooth Muscle Contraction

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...

Motor Unit Stimulation

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...

Relaxation of Skeletal Muscles

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.

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Related Experiment Video

Updated: Jul 4, 2026

Dissection of Single Skeletal Muscle Fibers for Immunofluorescent and Morphometric Analyses of Whole-Mount Neuromuscular Junctions

Dissection of Single Skeletal Muscle Fibers for Immunofluorescent and Morphometric Analyses of Whole-Mount Neuromuscular Junctions

Published on: August 14, 2021

Ultrastructural changes at the myotendinous junction induced by exercise.

Hiroshi Kojima¹, Eisuke Sakuma, Yoshio Mabuchi

¹Department of Musculoskeletal Medicine, Nagoya City University Medical School, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, Aichi, Japan.

Journal of Orthopaedic Science : Official Journal of the Japanese Orthopaedic Association

|June 6, 2008

Summary

Regular exercise significantly alters the structure of the myotendinous junction in rats, increasing the branching and altering the direction of finger-like processes as an adaptation to increased muscle tension.

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Treatment of Ligament Constructs with Exercise-conditioned Serum: A Translational Tissue Engineering Model

Treatment of Ligament Constructs with Exercise-conditioned Serum: A Translational Tissue Engineering Model

Published on: June 11, 2017

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Last Updated: Jul 4, 2026

Dissection of Single Skeletal Muscle Fibers for Immunofluorescent and Morphometric Analyses of Whole-Mount Neuromuscular Junctions

Dissection of Single Skeletal Muscle Fibers for Immunofluorescent and Morphometric Analyses of Whole-Mount Neuromuscular Junctions

Published on: August 14, 2021

Treatment of Ligament Constructs with Exercise-conditioned Serum: A Translational Tissue Engineering Model

Treatment of Ligament Constructs with Exercise-conditioned Serum: A Translational Tissue Engineering Model

Published on: June 11, 2017

Area of Science:

Exercise physiology
Muscle biology
Ultrastructural analysis

Background:

The myotendinous junction's role in preventing rupture is crucial, yet exercise-induced structural adaptations remain understudied.
This study investigates the ultrastructural changes in the rat myotendinous junction following a running exercise regimen.

Purpose of the Study:

To examine exercise-induced ultrastructural changes in the myotendinous junction of rat lower leg muscles.
To quantify changes in finger-like process branching frequency and direction.

Main Methods:

LETO rats were divided into exercise and control groups, with the exercise group running daily for 4 weeks.
Tibialis anterior and gastrocnemius muscles were analyzed using transmission electron microscopy (TEM).
Quantified branching frequency and directional angles of myotendinous junction finger-like processes.

Main Results:

Exercise significantly increased the frequency of finger-like process branching in both tibialis anterior (0.04 vs. 0.38) and gastrocnemius (0.18 vs. 1.16) muscles.
The direction of finger-like processes showed a significant shift in the exercise group (4.1° vs. 10.4° in tibialis anterior; 3.6° vs. 14.5° in gastrocnemius).
Statistical analysis confirmed significant differences between the exercise and control groups.

Conclusions:

Exercise induces significant morphological adaptations in the myotendinous junction.
These changes represent an adaptive response to the increased mechanical tension imposed by regular running exercise.