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Related Concept Videos

Muscle Contraction01:15

Muscle Contraction

Actin and Myosin in Muscle Contraction01:16

Actin and Myosin in Muscle Contraction

Actin and myosin are contractile proteins that form the sarcomere found in skeletal muscle tissues for regulating muscle contraction. Actin, a globular contractile protein, interacts with myosin for muscle contraction. The skeletal tissue appears striped or striated under a microscope due to the repeated arrangement of contractile proteins actin and myosin along the length of myofibrils. Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes...
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...
Excitation-Contraction Coupling in Skeletal Muscles01:20

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...
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.
Motor Unit Stimulation01:20

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: Jul 24, 2026

Procedures for Rat in situ Skeletal Muscle Contractile Properties
09:49

Procedures for Rat in situ Skeletal Muscle Contractile Properties

Published on: October 15, 2011

[Kinetic model of a single muscle contraction].

A P Poltorakov, V M Chibrikin, L A Piruzian

    Biofizika
    |January 1, 1978
    PubMed
    Summary

    A new model explains single muscle contraction by analyzing key biochemical reactions. Muscle contraction is directly linked to the concentration of mediator-receptor complexes, offering insights into muscle function.

    Area of Science:

    • Biophysics
    • Biochemistry
    • Physiology

    Context:

    • Muscle contraction is a fundamental physiological process.
    • Understanding the molecular mechanisms is crucial for various biological and medical applications.
    • Existing models may not fully capture the kinetic interplay of signaling pathways.

    Purpose:

    • To propose a novel biophysical model for single muscle contraction.
    • To investigate the kinetics of critical reactions involved in muscle activation.
    • To establish a correlation between biochemical events and mechanical output.

    Summary:

    • A mathematical model simulating single muscle contraction is presented.
    • The model incorporates two key reactions: mediator-receptor interaction and enzymatic mediator degradation.

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    The Mechanics of (Poro-)Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton
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    Last Updated: Jul 24, 2026

    Procedures for Rat in situ Skeletal Muscle Contractile Properties
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    Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles
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    Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles

    Published on: November 1, 2012

    The Mechanics of (Poro-)Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton
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    The Mechanics of (Poro-)Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton

    Published on: March 10, 2023

  • Muscle contraction parameters are quantitatively correlated with the concentration of the mediator-receptor complex.

    • Impact:

    • Provides a mechanistic understanding of muscle contraction at the molecular level.
    • Potential applications in drug development targeting muscle disorders.
    • Enhances the predictive capability of muscle response models.