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Related Concept Videos

Action Potential01:14

Action Potential

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Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
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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.
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...
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Relaxation of Skeletal Muscles01:29

Relaxation of Skeletal Muscles

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The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open....
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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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Generation of Action Potential in Skeletal Muscles01:24

Generation of Action Potential in Skeletal Muscles

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Every cell in the body maintains a membrane potential due to an uneven distribution of positive and negative charges across its plasma membrane. The membrane potential is measured in millivolts and quantifies the difference in charge across the membrane.
Like neurons, muscle cells are also regarded as excitable due to their capacity to change in response to stimuli, primarily due to voltage-gated ion channels embedded in their plasma membranes, which get activated by alterations in the...
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Smooth Muscle Contraction01:25

Smooth Muscle Contraction

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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.
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...
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Related Experiment Video

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In Vivo Intracellular Recording of Type-Identified Rat Spinal Motoneurons During Trans-Spinal Direct Current Stimulation
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State-dependent phenomena in cat masseter motoneurons

K A Kohlmeier1, F López-Rodríguez, R H Liu

  • 1Department of Physiology, UCLA School of Medicine 90024, USA.

Brain Research
|May 25, 1996
PubMed
Summary

Carbachol induces muscle atonia in alpha-chloralose-anesthetized cats by activating inhibitory systems. This study demonstrates that key neuronal mechanisms of active sleep, including inhibitory postsynaptic potentials (IPSPs), remain functional under anesthesia.

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Area of Science:

  • Neuroscience
  • Sleep Research
  • Anesthesiology

Background:

  • Muscle atonia during active sleep is a complex phenomenon.
  • Understanding the underlying neuronal mechanisms is crucial for sleep research.
  • Previous studies focused on unanesthetized animals.

Purpose of the Study:

  • To investigate the mechanisms of carbachol-induced muscle atonia in alpha-chloralose-anesthetized cats.
  • To compare these findings with natural active sleep atonia.
  • To determine if key inhibitory systems remain functional under anesthesia.

Main Methods:

  • Intracellular recordings from masseter motoneurons in alpha-chloralose-anesthetized cats.
  • Administration of carbachol to induce muscle atonia.
  • Stimulation of the nucleus pontis oralis (NPO) and observation of inhibitory postsynaptic potentials (IPSPs).

Main Results:

  • Carbachol-induced atonia was associated with glycine-mediated IPSPs in masseter motoneurons.
  • These IPSPs were reversed by chloride injection and abolished by strychnine.
  • Neuronal excitability decreased, with hyperpolarization and increased rheobase.
  • NPO stimulation induced IPSPs only after carbachol administration, demonstrating "reticular response-reversal" in anesthesia.
  • State-dependent IPSPs correlated with ponto-geniculo-occipital (PGO) waves were observed post-carbachol.

Conclusions:

  • The inhibitory system mediating active sleep atonia can be activated in alpha-chloralose-anesthetized animals.
  • Neuronal groups responsible for spontaneous IPSPs, reticular response-reversal, and PGO waves are functional during anesthesia.
  • This study provides the first demonstration of "reticular response-reversal" in an anesthetized preparation.