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Related Concept Videos

Cross-bridge Cycle01:26

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As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.
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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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Overview of Skeletal Muscle01:15

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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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Neuromuscular Junction And Blockade01:29

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The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...
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Skeletal Muscle Relaxants: Therapeutic Uses01:31

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Skeletal muscle relaxants are used to relax muscle tone and alleviate painful muscle contractions. However, the choice of skeletal muscle relaxants depends on the duration of the surgical procedure in order to minimize potential side effects. Skeletal muscle relaxants like neuromuscular blocking agents [NMBAs] are commonly employed as adjuvants alongside general anesthetics in clinical settings. NMBAs are also used to maintain controlled ventilation during surgery of the larynx or pharynx...
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The Muscular System01:18

The Muscular System

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The muscular system is essential to the body's overall structure and function, playing a crucial role in movement, stability, and internal processes. It consists of three distinct types of muscle tissue: the skeletal, the smooth, and the cardiac muscles.
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Related Experiment Video

Updated: Dec 28, 2025

Evaluation of Muscle Function of the Extensor Digitorum Longus Muscle Ex vivo and Tibialis Anterior Muscle In situ in Mice
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Bone Control of Muscle Function.

Giulia Battafarano1, Michela Rossi1, Francesco Marampon2

  • 1Bone Physiopathology Unit, Genetics and Rare Diseases Research Area, Bambino Gesù Children's Hospital, 00165 Rome, Italy.

International Journal of Molecular Sciences
|February 15, 2020
PubMed
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Osteocalcin, a bone-derived hormone, regulates muscle function and may reverse aging effects. This discovery highlights the skeleton's surprising role in endocrine regulation and offers potential therapies for age-related muscle loss.

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bonemuscleosteocalcin

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Area of Science:

  • Endocrinology
  • Bone and Muscle Biology
  • Gerontology

Background:

  • Bone and muscle form a functional unit, with bidirectional effects during disease.
  • While muscle's effect on bone is known, bone's regulation of muscle is less understood.
  • Irisin is a known crosstalk molecule; osteocalcin is a newly identified key player.

Purpose of the Study:

  • To investigate the role of osteocalcin in bone-muscle interaction.
  • To explore osteocalcin's potential as an anti-aging molecule.
  • To assess osteocalcin's therapeutic potential for sarcopenia.

Main Methods:

  • Review of existing literature on bone-muscle crosstalk.
  • Analysis of osteocalcin's carboxylation states and receptor binding (GPRC6A).
  • Examination of studies involving osteocalcin administration in animal models.

Main Results:

  • Undercarboxylated osteocalcin acts as a hormone released during bone resorption.
  • Osteocalcin binds to GPRC6A receptors in muscle, regulating its function.
  • Osteocalcin administration in aged mice improved physical abilities, suggesting anti-aging effects.

Conclusions:

  • Osteocalcin is a crucial bone-derived hormone regulating muscle physiology.
  • Osteocalcin exhibits anti-aging properties by influencing bone, muscle, and cognitive functions.
  • Osteocalcin represents a significant discovery in skeletal endocrine regulation with therapeutic implications for sarcopenia.