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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...

Isotonic and Isometric Muscle Contractions

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...

Generation of Action Potential in Skeletal Muscles

Generation of Action Potential in Skeletal Muscles

Every cell in the body maintains a membrane potential due to an uneven distribution of positive and negative charges across its plasma membrane. The membrane potential is measured in millivolts and quantifies the difference in charge across the membrane.
Like neurons, muscle cells are also regarded as excitable due to their capacity to change in response to stimuli, primarily due to voltage-gated ion channels embedded in their plasma membranes, which get activated by alterations in the cell's...

Muscle Contraction

Muscle Contraction

Muscle Contraction

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...

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...

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Related Experiment Video

Updated: May 10, 2026

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion

Published on: April 11, 2018

A 3D electro-mechanical continuum model for simulating skeletal muscle contraction.

B Hernández-Gascón¹, J Grasa, B Calvo

¹Aragón Institute of Engineering Research. University of Zaragoza, Ed. Betancourt, C/ Maria de Luna s/n 50018 Zaragoza, Spain. belenhg@unizar.es

Journal of Theoretical Biology

|July 4, 2013

Summary

This study presents a new 3D model for skeletal muscle contraction, accurately simulating active and passive muscle responses. The model successfully predicts muscle force generation and relationships, validated against experimental data.

Keywords:

Collagen fibres Finite element model Hyperelasticity Muscular fibres

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Last Updated: May 10, 2026

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Assessing Functional Metrics of Skeletal Muscle Health in Human Skeletal Muscle Microtissues

Assessing Functional Metrics of Skeletal Muscle Health in Human Skeletal Muscle Microtissues

Published on: February 18, 2021

Area of Science:

Biomechanics
Computational Biology
Muscle Physiology

Background:

Skeletal muscle contraction involves complex electro-mechanical processes.
Accurate computational models are crucial for understanding muscle function and dysfunction.

Purpose of the Study:

To develop and validate a thermodynamically consistent 3D electro-mechanical continuum model for skeletal muscle contraction.
To simulate both active and passive muscle responses under various conditions.

Main Methods:

A decoupled strain energy function was used for active and passive responses.
Finite element simulations were performed on simplified and detailed 3D muscle models (rat tibialis anterior).
Model inputs included magnetic resonance imaging data and fiber orientations.

Main Results:

The model accurately reproduced experimental data for isometric and concentric contractions of the rat tibialis anterior muscle.
Predicted force-velocity relationships aligned well with experimental data for rat extensor digitorum longus muscle.
The model demonstrated robustness in simulating 1D isometric, concentric, and eccentric contractions.

Conclusions:

The developed 3D electro-mechanical model provides a robust and accurate simulation of skeletal muscle contraction.
The model successfully captures key aspects of muscle active and passive mechanics.
This computational tool can aid in understanding muscle physiology and pathology.