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Related Concept Videos

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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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.
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...
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Generation of Action Potential in Skeletal Muscles01:24

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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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The Role of Actin and Myosin in Non-muscle Cells01:10

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Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They  are held...
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Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

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The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
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Updated: Aug 6, 2025

Cardiac Muscle-cell Based Actuator and Self-stabilizing Biorobot - PART 1
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Wet-Driven Bionic Actuators from Wool Artificial Yarn Muscles.

Ke Li1, Hua Shen1, Wenliang Xue1

  • 1Key Laboratory of Textile Science & Technology, Ministry of Education, College of Textiles, Donghua University, No. 2999, People's North Road,Songjiang District, Shanghai 201620, P. R. China.

ACS Applied Materials & Interfaces
|March 21, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed novel artificial muscles using wool yarn, mimicking natural muscle actions. These cost-effective, biocompatible wool muscles offer excellent flexibility and potential for bionic applications.

Keywords:
artificial musclebionic robotmoisture-driven actuatorssmart materialswool yarn

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Area of Science:

  • Materials Science
  • Biomimetics
  • Textile Engineering

Background:

  • Developing artificial muscles that mimic natural muscle functionality is a key goal in advanced materials science.
  • Existing artificial muscle materials face challenges including scarcity, biological incompatibility, and limited flexibility, hindering commercialization.
  • Imitating the complex behaviors of real muscles remains a significant hurdle for current artificial muscle technologies.

Purpose of the Study:

  • To present multidimensional wool yarn artificial muscles with wet-driven behaviors.
  • To demonstrate the cost-effectiveness, biocompatibility, and structural versatility of wool-based artificial muscles.
  • To explore the potential of wool artificial muscles in bionic drivers and intelligent textiles.

Main Methods:

  • Inducing wet response in wool yarn by reducing the water-repellent effect of wool scales.
  • Fabricating wool artificial muscles with torsional, contractile, and multilayered structures.
  • Utilizing theoretical modeling and numerical simulation to explain the working mechanism.
  • Integrating yarn muscles into a wool muscle group using textile technology.

Main Results:

  • Successfully created wool yarn artificial muscles exhibiting wet-driven behaviors.
  • Wool artificial muscles demonstrated cost-effectiveness, wide availability, good biocompatibility, structural stability, softness, and flexibility.
  • The working mechanism of wool artificial yarn muscles was theoretically explained and numerically verified.
  • Demonstrated the integration of wool artificial muscles into a muscle group for application in robotic bionic arms.

Conclusions:

  • Wool yarn artificial muscles offer a promising, cost-effective, and biocompatible alternative to existing materials.
  • The structural versatility and wet-driven capabilities of wool muscles open avenues for diverse applications.
  • Wool artificial muscles show significant potential for use in bionic drivers and the intelligent textile industry.