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Related Concept Videos

Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
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Excitation-Contraction Coupling in Skeletal Muscles01:20

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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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Motor Unit Stimulation01:20

Motor Unit Stimulation

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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.
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Mechanism of Ciliary Motion01:05

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The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
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Mechanism of Ciliary Motion01:05

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Torsional Pendulum01:09

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A torsional pendulum involves the oscillation of a rigid body in which the restoring force is provided by the torsion in the string from which the rigid body is suspended. Ideally, the string should be massless; practically, its mass is much smaller than the rigid body's mass and is neglected.
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Updated: Apr 30, 2026

Method to Measure Tone of Axial and Proximal Muscle
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Published on: December 14, 2011

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Powerful, multifunctional torsional micromuscles activated by phase transition.

Kai Liu, Chun Cheng, Joonki Suh

    Advanced Materials (Deerfield Beach, Fla.)
    |April 26, 2014
    PubMed
    Summary

    Micro bimorph coils utilizing vanadium dioxide

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    Area of Science:

    • Materials Science
    • Mechanical Engineering
    • Nanotechnology

    Background:

    • Microscopic actuators are crucial for micro-robotics and micro-devices.
    • Existing micro-actuators often face limitations in speed, durability, and power density.

    Purpose of the Study:

    • To develop and characterize novel micro bimorph coils for high-performance actuation.
    • To investigate the potential of vanadium dioxide's metal-insulator transition for mechanical motion.

    Main Methods:

    • Fabrication of micro bimorph coils incorporating vanadium dioxide (VO2).
    • Utilizing the metal-insulator phase transition in VO2 to drive torsional motion.
    • Testing of coil performance over one million cycles to assess durability.
    • Measurement of rotational speed, amplitude, and power density.

    Main Results:

    • Demonstrated reversible torsional motion in micro bimorph coils.
    • Achieved over one million cycles of operation without degradation.
    • Exhibited superior rotational speeds up to approximately 200,000 rpm.
    • Measured an amplitude of 500° per mm length and a power density up to approximately 39 kW kg⁻¹.

    Conclusions:

    • Micro bimorph coils driven by VO2's phase transition act as effective torsional muscles.
    • These actuators offer high speed, exceptional durability, and significant power density for micro-scale applications.