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Related Concept Videos

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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Structure and Organization of Smooth Muscles01:13

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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.
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Smooth Muscle Contraction01:25

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

Brian A Camley1

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

Cell
|May 18, 2022
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Summary
This summary is machine-generated.

Researchers reconstituted avian skin follicle patterns ex vivo. They discovered that cell contractility drives tissue flow, creating mechanical instability that forms these ordered patterns.

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Area of Science:

  • Developmental biology
  • Tissue mechanics
  • Cellular dynamics

Background:

  • The development of ordered patterns in biological tissues, such as the follicle patterns in avian skin, is a complex process.
  • Understanding the underlying mechanisms driving pattern formation is crucial for regenerative medicine and developmental biology.

Purpose of the Study:

  • To investigate the self-organization principles governing the formation of ordered follicle patterns in avian skin.
  • To determine the role of mechanical forces and cellular behavior in establishing tissue architecture ex vivo.

Main Methods:

  • Reconstitution of avian skin follicle patterns using ex vivo organ culture.
  • Live imaging and computational modeling to analyze cell contractility and tissue flow.
  • Perturbation experiments to assess the impact of mechanical forces on pattern development.

Main Results:

  • Demonstrated that ordered follicle patterns can emerge spontaneously from a reconstituted avian skin system.
  • Identified cell contractility as a key driver of tissue flow, leading to mechanical instabilities.
  • Showed that these mechanical instabilities are sufficient to generate the observed ordered follicle patterns.

Conclusions:

  • The study reveals a novel mechanism for pattern formation in biological tissues driven by intrinsic mechanical instabilities.
  • Cellular contractility and resulting tissue flow play a critical role in establishing the ordered follicle pattern in avian skin.
  • These findings provide insights into the physical principles governing morphogenesis and tissue self-organization.