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Related Concept Videos

Generation of Action Potential in Skeletal Muscles01:24

Generation of Action Potential in Skeletal Muscles

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Every cell in the body maintains a membrane potential due to an uneven distribution of positive and negative charges across its plasma membrane. The membrane potential is measured in millivolts and quantifies the difference in charge across the membrane.
Like neurons, muscle cells are also regarded as excitable due to their capacity to change in response to stimuli, primarily due to voltage-gated ion channels embedded in their plasma membranes, which get activated by alterations in the...
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Muscle Stimulation Frequency01:22

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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
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Motor Unit Stimulation01:20

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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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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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Power Expended by a Constant Force00:57

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The relationship between work done and the time taken to do it can be explained using the concept of power. For example, several sprinters in a race may have the same velocity when they reach the finish line, therefore doing the same amount of work, but the winner does it in the least amount of time. Thus, power is defined as the rate of doing work. Since work can vary as a function of time, the average power is defined as the work done during a time interval, divided by the time interval.
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Related Experiment Video

Updated: Sep 29, 2025

Rapid Manufacturing of Thin Soft Pneumatic Actuators and Robots
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Power Amplification for Jumping Soft Robots Actuated by Artificial Muscles.

Adriane Fernandes Minori1,2, Saurabh Jadhav1, Haojin Chen1

  • 1Department of Mechanical and Aerospace Engineering, University of California, San Diego, CA, United States.

Frontiers in Robotics and AI
|March 21, 2022
PubMed
Summary

Researchers developed a novel electrically powered soft amplification mechanism for untethered mesoscale jumping robots. This system enables rapid locomotion, overcoming limitations of previous soft robotic actuation methods.

Keywords:
jumpingliquid crystal elastomermodular system designpower amplificationsoft robot

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Area of Science:

  • Robotics
  • Materials Science
  • Mechanical Engineering

Background:

  • Soft robots offer passive adaptation and impact mitigation.
  • Jumping is a promising locomotion for soft robots, but requires compact, lightweight actuation.
  • Existing actuation methods for mesoscale jumping robots have limitations like rigid components or external power.

Purpose of the Study:

  • To design and fabricate an electrically powered soft amplification mechanism for untethered mesoscale jumping robots.
  • To achieve tunable performance and rapid jumping motions.
  • To overcome the slow contraction rates of soft actuators.

Main Methods:

  • Utilized a liquid crystal elastomer (LCE) actuator with tunable geometry.
  • Incorporated an elastic hemispherical shell and a pouch motor for active latching.
  • Engineered a soft amplification mechanism to boost actuator power output.

Main Results:

  • Achieved an 8.12 × 10^3 power amplification factor.
  • Demonstrated a specific power of 26.4 W/kg.
  • Successfully propelled a 20 g payload to a jump height of 55.6 mm.

Conclusions:

  • The developed soft amplification mechanism enables electrically untethered mesoscale soft systems.
  • This approach facilitates rapid motions like jumping in soft robots.
  • Opens avenues for future research in untethered, high-performance soft robotic locomotion.