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関連する概念動画

Motor Unit Stimulation01:20

Motor Unit Stimulation

2.1K
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...
2.1K
Structure and Organization of Smooth Muscles01:13

Structure and Organization of Smooth Muscles

6.3K
Smooth muscle tissue is a type of muscle tissue that can be found lining various vital organs in the human body, including the lungs, blood vessels, digestive tract, and respiratory tract. This type of tissue is responsible for regulating the movements of these organs, playing crucial roles in the functioning of various systems, including the vascular, digestive, respiratory, and urinary systems.
Structure of smooth muscle cell
Smooth muscle cells are spindle-shaped with tapering ends and a...
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Smooth Muscle Contraction01:25

Smooth Muscle Contraction

4.0K
Smooth muscle contraction is a complex process vital for various bodily functions, from maintaining blood vessel tension to facilitating the movement of food through the digestive tract. Unlike striated muscles, smooth muscle contraction begins more slowly and lasts longer.
The onset of contraction is triggered by an increase in calcium ions within the sarcoplasm, similar to the process in striated muscle. However, smooth muscles have a relatively smaller reservoir of the sarcoplasmic...
4.0K
Excitation-Contraction Coupling in Skeletal Muscles01:20

Excitation-Contraction Coupling in Skeletal Muscles

10.0K
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...
10.0K
Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

2.8K
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...
2.8K
Actin and Myosin in Muscle Contraction01:16

Actin and Myosin in Muscle Contraction

15.1K
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...
15.1K

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Updated: Sep 22, 2025

The Mechanics of Poro-Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton
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The Mechanics of Poro-Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton

Published on: March 10, 2023

878

収縮によるパターニング

Brian A Camley1

  • 1William H. Miller III Department of Physics & Astronomy; Department of Biophysics, Johns Hopkins University, Baltimore, Maryland, USA.

Cell
|May 18, 2022
PubMed
まとめ
この要約は機械生成です。

研究者は鳥の皮の毛穴のパターンをex vivoで再構成した. 細胞の収縮性が 組織の流れを促し 機械的な不安定性を生み出し 秩序あるパターンを形成することを発見しました

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Pattern Generation for Micropattern Traction Microscopy
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Live Imaging and Analysis of Muscle Contractions in Drosophila Embryo
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Live Imaging and Analysis of Muscle Contractions in Drosophila Embryo

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関連する実験動画

Last Updated: Sep 22, 2025

The Mechanics of Poro-Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton
08:50

The Mechanics of Poro-Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton

Published on: March 10, 2023

878
Pattern Generation for Micropattern Traction Microscopy
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Live Imaging and Analysis of Muscle Contractions in Drosophila Embryo
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科学分野:

  • 発達生物学
  • 組織力学
  • 細胞動態

背景:

  • 鳥の皮膚の卵泡パターンのような 生物学的組織における 秩序あるパターンの形成は 複雑なプロセスです
  • 再生医学と発達生物学にとって パターンの形成を促す根本的なメカニズムを理解することは 極めて重要です

研究 の 目的:

  • 鳥の皮膚におけるオーダーされた卵泡のパターンの形成を制御する自己組織化の原理を調査する.
  • 組織構造をex vivoで確立する際の機械的力と細胞行動の役割を決定する.

主な方法:

  • ex vivo 臓器培養を用いた鳥の皮の卵泡パターンの復元
  • 細胞の収縮性と組織の流れを分析するために,ライブイメージングとコンピュータモデリングを行います.
  • パターン開発に機械的な力の影響を評価するための混乱実験.

主要な成果:

  • 再構成された鳥の皮膚系から オーダーされた卵泡のパターンが自発的に出現することが示された.
  • 細胞の収縮性が組織の流れの主な要因で 機械的な不安定性をもたらします
  • これらの機械的不安定性は,観察されたオーダーされた卵泡パターンを生成するのに十分であることを示した.

結論:

  • この研究は,内在的な機械的不安定性によって引き起こされる 生物学的組織におけるパターンの形成のための新しいメカニズムを明らかにしています
  • 細胞の収縮性とその結果生じる組織の流れは,鳥の皮膚のオーダーされた卵泡パターンを確立する上で重要な役割を果たします.
  • これらの発見は,形態発生と組織の自己組織化を制御する物理的原理の洞察を提供します.