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Related Concept Videos

Muscle Contraction01:15

Muscle Contraction

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...
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...
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...
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...
Isotonic and Isometric Muscle Contractions01:22

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...

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Electromechanical Assessment of Optogenetically Modulated Cardiomyocyte Activity
12:52

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Published on: March 5, 2020

An electrooptical muscle contraction sensor.

Alessio Chianura, Mario E Giardini

    Medical & Biological Engineering & Computing
    |May 22, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel electrooptical sensor detects muscle contraction using infrared light backscattering. This less invasive method offers improved accuracy over traditional techniques, distinguishing between isometric and isotonic contractions.

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    Area of Science:

    • Biomedical Engineering
    • Optics
    • Physiology

    Background:

    • Muscle contraction monitoring is crucial for diagnostics and rehabilitation.
    • Existing methods like electromyography have limitations including invasiveness and susceptibility to noise.
    • Optical methods offer potential for non-invasive muscle activity assessment.

    Purpose of the Study:

    • To introduce a novel electrooptical sensor for detecting muscle contraction.
    • To evaluate the sensor's performance and advantages over existing technologies.
    • To demonstrate the sensor's capability in differentiating contraction types.

    Main Methods:

    • Infrared light is introduced into the muscle tissue.
    • Backscattered light is analyzed, focusing on directional differences.
    • Changes in light scattering patterns correlate with muscle contraction intensity and type.

    Main Results:

    • The electrooptical sensor successfully detects muscle contraction via infrared light backscattering.
    • The device exhibits lower invasiveness and reduced sensitivity to electromagnetic noise and movement artifacts.
    • The sensor can differentiate between isometric and isotonic muscle contractions.

    Conclusions:

    • The developed electrooptical sensor provides a promising, less invasive alternative for muscle contraction monitoring.
    • This technology offers enhanced accuracy and new capabilities for distinguishing contraction types.
    • Further research can explore clinical applications in diagnostics and physical therapy.