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Related Concept Videos

Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

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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
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
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Tension01:10

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Tension is a force along the length of a medium, in particular, a force carried by a flexible medium, such as a rope or cable. The word "tension" comes from Latin, meaning "to stretch". Not coincidentally, the flexible cords that carry muscle forces to other parts of the body are called tendons. Any flexible connector, such as a string, rope, chain, wire, or cable, can exert pull only parallel to its length; so, a force carried by a flexible connector is a tension with a...
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Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin01:26

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Directly acting muscle relaxants like dantrolene and botulinum toxin (BoNT) have distinct mechanisms and applications. Dantrolene, a hydantoin derivative, acts on the ryanodine receptor (RYR1) in skeletal muscle cells. RYR1 are calcium channels present at the sarcoplasmic reticulum membrane. In response to excitation, they release calcium ions from the sarcoplasmic reticulum to the cytosol. Calcium promotes actin-myosin-mediated contraction of muscles.
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Somatic Spinal Reflexes01:22

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Somatic spinal reflexes are rapid, involuntary muscular responses to external stimuli that involve the somatic musculature and the spinal cord.
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Excitation-Contraction Coupling in Skeletal Muscles01:20

Excitation-Contraction Coupling in Skeletal Muscles

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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 Contraction

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Related Experiment Video

Updated: Jan 18, 2026

An in vivo Rodent Model of Contraction-induced Injury and Non-invasive Monitoring of Recovery
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Tetanus.

Önder Ergönül1, Selin Kolsuz2, J Peter Figueroa3

  • 1Koç University School of Medicine, Infectious Diseases and Clinical Microbiology, Istanbul, Türkiye; Koç University İşbank Center for Infectious Diseases, Koç University Hospital, Istanbul, Türkiye.

Lancet (London, England)
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Summary
This summary is machine-generated.

Tetanus remains a global threat despite vaccination, causing thousands of deaths annually. Ongoing research addresses prevention, diagnosis, and treatment challenges for this serious infectious disease.

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Area of Science:

  • Infectious Diseases
  • Immunology
  • Public Health

Background:

  • Tetanus, a preventable bacterial infection, still causes significant global mortality (30,000-50,000 deaths/year).
  • Adult tetanus persists, particularly in individuals with compromised immunity, diabetes, or a history of injecting drug use.
  • Current diagnosis is clinical, with management involving wound care, antibiotics, and antitoxin, but critical questions persist.

Purpose of the Study:

  • To review the current state of tetanus prevention, diagnosis, and management.
  • To highlight persistent challenges and unanswered questions in clinical practice and research.
  • To emphasize the importance of vaccination, surveillance, and novel therapeutic strategies.

Main Methods:

  • Literature review and synthesis of recent clinical trial data.
  • Analysis of current diagnostic criteria and treatment protocols.
  • Examination of epidemiological trends and risk factors for adult tetanus.

Main Results:

  • Human and equine antitoxins show comparable efficacy, yet availability and cost remain issues.
  • Autonomic instability is now recognized as an early disease manifestation impacting prognosis.
  • Nosocomial infections complicate intensive care management, increasing patient burden.

Conclusions:

  • Vaccination remains the cornerstone of tetanus prevention.
  • Equitable access to vaccines and antitoxins is crucial.
  • Further research into new therapies and improved surveillance is vital to reduce the global burden of tetanus.