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Related Concept Videos

Sympathetic Signaling01:31

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Sympathetic signaling, a vital part of the autonomic nervous system, plays a crucial role in mobilizing the body's resources in response to stress or emergencies. It involves the transmission of nerve impulses from sympathetic preganglionic fibers to postganglionic fibers. This results in the release of specific neurotransmitters and activation of adrenergic receptors.
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The sympathetic pathways of the collateral ganglia and adrenal medulla serve unique but interconnected roles in the sympathetic response.
Collateral Ganglia
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The sympathetic division of the autonomic nervous system (ANS) plays a crucial role in preparing the body for stress, physical activity, and increased energy demands. This division activates the "fight-or-flight" response, enabling individuals to respond effectively to challenging situations.
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The sympathetic chain ganglia, also known as the sympathetic trunk ganglia or paravertebral ganglia, are a series of ganglia located bilaterally on either side of the spinal column. These ganglia serve as relay stations for the sympathetic nervous system. Preganglionic neurons originating in the spinal cord project their axons to the sympathetic chain ganglia. Within the ganglia, these preganglionic fibers synapse with postganglionic neurons.The postganglionic neurons of the sympathetic trunk...
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The sympathetic division can influence tissues and organs by releasing norepinephrine at peripheral synapses and distributing epinephrine and norepinephrine through the bloodstream. In times of crisis or stress, sympathetic activation occurs, which is regulated by sympathetic centers in the hypothalamus. As a result, sympathetic activation prepares the body for physical exertion, rapid ATP production, and heightened alertness, allowing individuals to respond effectively to challenging or...
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Related Experiment Video

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Assessment of Vascular Tone Responsiveness using Isolated Mesenteric Arteries with a Focus on Modulation by Perivascular Adipose Tissues
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Modelling the vascular response to sympathetic postganglionic nerve activity.

Linford J B Briant1, Julian F R Paton2, Anthony E Pickering3

  • 1School of Physiology & Pharmacology, Medical Sciences Building, University Walk, University of Bristol, Bristol BS8 1TD, UK; Department of Engineering Mathematics, Merchant Venturers Building, Woodland Road, University of Bristol, Bristol BS8 1UB, UK.

Journal of Theoretical Biology
|February 21, 2015
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Summary

Sympathetic nervous system bursts, not regular firing, drive arterial contractions. Hypertensive bursts significantly increase contractile force, contributing to hypertension pathology.

Keywords:
BurstingCalcium dynamicsHypertensionNeurone dynamicsSympathetic nervous system

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Area of Science:

  • Physiology
  • Computational Biology
  • Cardiovascular Research

Background:

  • The sympathetic nervous system regulates arterial tone.
  • Understanding neural control of arterial contractility is crucial for cardiovascular health.
  • Previous models often simplified neural stimulation patterns.

Purpose of the Study:

  • To model the pathway from sympathetic neural activity to arterial smooth muscle contraction.
  • To investigate the influence of sympathetic nervous system burst properties on arterial contractility.
  • To compare the effects of normal versus hypertensive neural firing patterns.

Main Methods:

  • Developed a differential equation mathematical model integrating known physiological processes.
  • Simulated neural stimulation using tonic and respiratory-modulated burst patterns.
  • Utilized preganglionic spike trains from wild-type and spontaneously hypertensive rats.

Main Results:

  • The model showed unresponsiveness to tonic sympathetic stimulation but marked contractions with burst patterns.
  • Contractile force was highly dependent on the number of spikes within each burst.
  • Hypertensive rat spike trains produced 10-fold greater contractile force compared to wild-type.

Conclusions:

  • Respiratory-modulated sympathetic bursts, not tonic firing, significantly impact arterial contractility.
  • Increased spiking in hypertensive bursts leads to greater noradrenaline release and contractility.
  • Hypertensive neural activity's effect on smooth muscle tone may contribute to hypertension pathology.