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Related Concept Videos

Smooth Muscle Contraction01:25

Smooth Muscle Contraction

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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...
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Structure and Organization of Smooth Muscles01:13

Structure and Organization of Smooth Muscles

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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...
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Muscle Contraction01:10

Muscle Contraction

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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...
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Functions of Smooth Muscles01:23

Functions of Smooth Muscles

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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...
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Actin and Myosin in Muscle Contraction01:16

Actin and Myosin in Muscle Contraction

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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...
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Excitation-Contraction Coupling in Skeletal Muscles01:20

Excitation-Contraction Coupling in Skeletal Muscles

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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...
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Related Experiment Video

Updated: Aug 29, 2025

Utilizing the Precision-Cut Lung Slice to Study the Contractile Regulation of Airway and Intrapulmonary Arterial Smooth Muscle
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Utilizing the Precision-Cut Lung Slice to Study the Contractile Regulation of Airway and Intrapulmonary Arterial Smooth Muscle

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Canine Smooth Muscle Contraction Model.

Joseph L Palladino

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |September 10, 2022
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a new model to describe smooth muscle contraction, unifying passive and active forces. The model accurately predicts various smooth muscle behaviors using a single equation and parameter set.

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    Area of Science:

    • Physiology
    • Biophysics
    • Biomedical Engineering

    Background:

    • Smooth muscle, crucial for bodily functions, shares contractile proteins with striated muscle but has a less understood mechanism.
    • Previous lumped models successfully described cardiac and skeletal muscle contraction.

    Purpose of the Study:

    • To quantitatively describe canine smooth muscle contractile properties using a previously developed lumped model.
    • To establish a unified constitutive relation for smooth muscle mechanics.

    Main Methods:

    • Applied a lumped model of muscle contraction to canine smooth muscle data from existing literature.
    • Used a single equation relating muscle force, length, and time to analyze contractile properties.

    Main Results:

    • A single equation and parameter set accurately described smooth muscle's passive and active isometric forces.
    • The model successfully predicted isometric twitch and isotonic contractions.
    • An inverse force-velocity relation emerged from the model without prior assumptions.

    Conclusions:

    • The developed constitutive relation offers a quantitative description of smooth muscle mechanics.
    • This model can be integrated into larger physiological models for applications like blood vessel constriction and bladder function.