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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...

Structure and Organization of Smooth Muscles

Structure and Organization of Smooth Muscles

Smooth muscle tissue is a type of muscle tissue that can be found lining various vital organs in the human body, including the lungs, blood vessels, digestive tract, and respiratory tract. This type of tissue is responsible for regulating the movements of these organs, playing crucial roles in the functioning of various systems, including the vascular, digestive, respiratory, and urinary systems.
Structure of smooth muscle cell
Smooth muscle cells are spindle-shaped with tapering ends and a...

Functions of Smooth Muscles

Functions of Smooth Muscles

Smooth muscles are an important type of muscle tissue that plays a vital role in the involuntary movements of internal organs. For example, they help regulate the movement of food through the gut and the flow of blood through the circulatory system.
Function of visceral smooth muscles
Visceral smooth muscle is found in the walls of all hollow organs, except the heart, and is a key player in the involuntary movements that drive the functioning of these internal organs. This tissue is arranged in...

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...

Muscle Contraction

Muscle Contraction

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...

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Related Experiment Video

Updated: May 19, 2026

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

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

Published on: March 10, 2023

A three-dimensional chemo-mechanical continuum model for smooth muscle contraction.

Markus Böl¹, André Schmitz, Götz Nowak

¹Institute of Solid Mechanics, Technische Universität Braunschweig, 38106 Braunschweig, Germany. m.boel@tu-bs.de

Journal of the Mechanical Behavior of Biomedical Materials

|August 29, 2012

Summary

This study presents a 3D model for smooth muscle contraction, integrating mechanical forces and calcium levels. The model accurately simulates muscle behavior, showing its potential for realistic artery simulations.

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Last Updated: May 19, 2026

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

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Published on: March 10, 2023

Construction of a Human Aorta Smooth Muscle Cell Organ-On-A-Chip Model for Recapitulating Biomechanical Strain in the Aortic Wall

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Published on: July 6, 2022

Area of Science:

Computational mechanics
Biophysics
Biomaterials science

Background:

Smooth muscle contraction is regulated by complex chemo-mechanical interactions.
Existing models often lack detailed integration of calcium dynamics and passive tissue properties.

Purpose of the Study:

To develop a chemo-mechanically coupled 3D model for smooth muscle contractile behavior.
To incorporate a detailed calcium-dependent cross-bridge mechanism into a continuum mechanics framework.

Main Methods:

A strain energy function was additively decomposed into passive (elastin, collagen) and active (calcium-driven) components.
The four-state cross-bridge model by Hai and Murphy was implemented within the finite element method.
Three-dimensional boundary-value problems and simulations on idealized arteries were used for validation.

Main Results:

The model successfully describes the contractile behavior of smooth muscles based on placement and calcium concentration.
Simulations demonstrated the model's capability to handle complex 3D scenarios.
Applicability to realistic geometries, such as arteries, was shown.

Conclusions:

The presented chemo-mechanical model provides a robust framework for understanding smooth muscle function.
The integration of calcium dynamics enhances the predictive power for muscle contraction.
The model is suitable for analyzing biomechanical phenomena in various smooth muscle tissues.