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Related Concept Videos

Muscle Contraction01:15

Muscle Contraction

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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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Actin and Myosin in Muscle Contraction01:16

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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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Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions01:27

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions

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Nondepolarizing neuromuscular blockers prevent the membrane depolarization of muscle cells and inhibit muscle contraction. These are usually administered with anesthetics to achieve complete muscle relaxation. Upon administration, these drugs first block the small, rapidly contracting muscles of the face and hands, followed by the larger muscles of the trunk and the intercostal muscles. The diaphragm is the last muscle to be affected.
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Overview of Skeletal Muscle01:15

Overview of Skeletal Muscle

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Skeletal muscles are composed of a bundle of muscle fibers and are attached to bones through tendons. Each skeletal muscle fiber is a single muscle cell. The sarcolemma, the plasma membrane of a skeletal muscle cell, consists of a lipid bilayer and glycocalyx that supports muscle fibers. The sarcolemma extends into the muscle cells to form tubular structures called transverse or T-tubules. Each side of the T-tubules consists of a membrane-bound structure called the sarcoplasmic reticulum,...
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Classification of Skeletal Muscle Relaxants01:28

Classification of Skeletal Muscle Relaxants

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Skeletal muscle relaxants are a group of drugs that can reduce muscle stiffness and induce temporary paralysis to relieve pain. These agents can act centrally to reduce muscle tone or spasms in painful conditions such as multiple sclerosis (MS), amyotrophic lateral sclerosis (ALS), or spinal injuries; they are called antispasmodics or spasmolytics.
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Updated: Sep 21, 2025

Fabrication of Carbon-Based Ionic Electromechanically Active Soft Actuators
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Nanostructured block copolymer muscles.

Chao Lang1,2,3, Elisabeth C Lloyd2, Kelly E Matuszewski2

  • 1South China Advanced Institute for Soft Matter Science and Technology, School of Emergent Soft Matter, South China University of Technology, Guangzhou, China.

Nature Nanotechnology
|June 2, 2022
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Summary
This summary is machine-generated.

Researchers developed advanced fiber actuators using block copolymers that mimic muscle structure. These high-performance actuators offer superior efficiency, strain, and mechanical properties for robotics and smart clothing applications.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Robotics

Background:

  • High-performance actuating materials are crucial for advancements in robotics, prosthetics, and smart clothing.
  • Current actuators often face limitations in efficiency, strain, and mechanical robustness.

Purpose of the Study:

  • To develop novel fiber actuators with enhanced performance characteristics.
  • To explore the potential of block copolymer self-assembly and strain-programmed crystallization for actuator fabrication.

Main Methods:

  • Utilized solution-phase block copolymer self-assembly.
  • Employed strain-programmed crystallization to create aligned nanoscale structures.
  • Fabricated fiber actuators with alternating crystalline and amorphous domains.

Main Results:

  • Achieved high efficiency (75.5%) and actuation strain (80%).
  • Demonstrated exceptional mechanical properties, including strain-at-break up to 900% and toughness up to 121.2 MJ/m³.
  • Exhibited on/off rotary actuation (450 rpm) and multi-trigger actuation (heat, hydration).

Conclusions:

  • The nanostructured block copolymer muscles offer significant advantages over existing actuators.
  • The facile fabrication method, versatility, and recyclability open new possibilities for multifunctional actuators.
  • These findings pave the way for advanced robotics, prosthetics, and smart textiles.