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Related Concept Videos

Sympathetic Activation01:17

Sympathetic Activation

5.0K
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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Sympathetic Signaling01:32

Sympathetic Signaling

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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.
Sympathetic preganglionic fibers release the neurotransmitter acetylcholine (ACh) onto the ganglionic neurons in the...
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The Sympathetic Nervous System01:25

The Sympathetic Nervous System

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Overview
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Sympathetic Pathways: Collateral Ganglia and Adrenal Medulla01:28

Sympathetic Pathways: Collateral Ganglia and Adrenal Medulla

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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
Sympathetic preganglionic axons reach the collateral ganglia along the route of splanchnic nerves. These nerves bypass the sympathetic trunk and communicate with sympathetic postganglionic neurons housed in the prevertebral ganglia. These ganglia supply the organs of the abdominopelvic cavity.
The greater splanchnic nerve, formed by the...
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Hypodermis01:02

Hypodermis

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The hypodermis (the subcutaneous layer or superficial fascia) is present directly below the dermis. It connects the skin to the underlying fascia (fibrous tissue) of the bones and muscles. It is not strictly a part of the skin, although the border between the hypodermis and dermis can be difficult to distinguish. The hypodermis consists of well-vascularized, loose, areolar connective tissue and adipose tissue, which functions as a mode of fat storage and provides insulation and cushioning for...
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Hypothalamic-Pituitary Axis01:37

Hypothalamic-Pituitary Axis

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The response to stress—be it physical or psychological, acute or chronic—involves activation of the Hypothalamic-Pituitary-Adrenal (HPA) axis. The HPA axis is part of the neuroendocrine system because it involves both neuronal and hormonal communication. Its function is to regulate homeostatic systems—metabolic, cardiovascular, and immune—providing the necessary means to respond to a stressor.
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Related Experiment Video

Updated: Jun 6, 2025

Measuring the Rate of Lipolysis in Ex Vivo Murine Adipose Tissue and Primary Preadipocytes Differentiated In Vitro
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Sympathetic NPY ignites adipose tissue.

Óscar Freire-Agulleiro1, Miguel López1

  • 1NeurObesity Group, Department of Physiology, CIMUS, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706 Santiago de Compostela, Spain.

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Summary
This summary is machine-generated.

Neuropeptide Y (NPY) from sympathetic neurons combats obesity. This finding challenges the traditional view, revealing NPY

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Area of Science:

  • Neuroendocrinology
  • Metabolic Regulation
  • Obesity Research

Background:

  • Hypothalamic neuropeptide Y (NPY) is traditionally recognized for its role in stimulating appetite and promoting weight gain.
  • Emerging research suggests alternative functions for NPY in metabolic control.

Purpose of the Study:

  • To investigate the role of NPY produced by sympathetic neurons in regulating energy balance and body weight.
  • To challenge the established orexigenic effects of NPY by exploring its thermogenic functions.

Main Methods:

  • Utilized a combination of genetic models and physiological assessments in mice.
  • Investigated the source and function of NPY within the sympathetic nervous system.
  • Measured energy expenditure and thermogenesis in response to NPY signaling.

Main Results:

  • Demonstrated that NPY synthesized by sympathetic neurons exerts anti-obesity effects.
  • Showcased that sympathetic NPY promotes thermogenesis, thereby increasing energy expenditure.
  • Contradicted the conventional understanding of NPY's metabolic impact.

Conclusions:

  • Sympathetic neuron-derived NPY plays a protective role against obesity.
  • Targeting sympathetic NPY pathways may offer novel therapeutic strategies for metabolic disorders.
  • Revises the understanding of NPY's complex role in energy homeostasis.