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Related Concept Videos

Physiology of Respiration II: Neurogenic Control of Respiration01:22

Physiology of Respiration II: Neurogenic Control of Respiration

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The neurogenic control of respiration coordinates various neural networks and pathways to regulate breathing rate and depth, meeting the body's oxygen and carbon dioxide exchange requirements. This system adapts to physiological and environmental conditions, ensuring optimal breathing patterns.
Central Control
The brainstem is the primary site of central control, hosting respiratory centers:
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Neural Control of Respiration01:18

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The neural regulation of respiration is a meticulously coordinated process primarily controlled by the respiratory centers located within the brainstem. These centers, composed of specialized neurons, transmit nerve impulses that control the contraction and relaxation of our respiratory muscles.
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Two primary areas comprise the respiratory center: the medullary respiratory center in the medulla oblongata and the pontine respiratory group in the pons. The...
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Physiological Control of Respiration01:23

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Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
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Chemical Factors Affecting Respiration Centers01:31

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Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
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Respiratory Regulation of Acid-Base Balance01:18

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Respiratory compensation is a vital physiological process that stabilizes blood plasma pH by regulating the partial pressure of carbon dioxide (PCO2), a key determinant of pH levels. Most carbon dioxide in the blood dissolves and converts into carbonic acid (H2CO3). It dissociates into hydrogen ions (H+) and bicarbonate ions (HCO3⁻). There is also an inverse relationship between PCO2​​ and pH.
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Gross Anatomy of the Lungs01:17

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The lungs are a pair of vital organs connected to the trachea via the left and right bronchi. The base of these organs meets the dome-shaped muscle known as the diaphragm. Encased by the pleurae, the lungs contact the mediastinum. The right lung is shorter yet wider, and has a larger volume than the left lung. The left lung has an indentation known as the cardiac notch. The superior region of the lungs is referred to as the apex, whereas the base is the lower region near the diaphragm. The...
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Related Experiment Video

Updated: Feb 21, 2026

Analyzing the Size, Shape, and Directionality of Networks of Coupled Astrocytes
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Astrocytes release prostaglandin E2 to modify respiratory network activity.

David Forsberg1, Thomas Ringstedt1, Eric Herlenius1

  • 1Department of Women's and Children's Health, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden.

Elife
|October 5, 2017
PubMed
Summary

Astrocytes in the respiratory control center release prostaglandin E2 (PGE2), modulating breathing. This discovery reveals a new role for astrocytes in regulating respiratory rhythm and response to carbon dioxide.

Keywords:
astrocytesbrainstemchemosensitivitymouseneural networkneuroscienceprostaglandinsrespiration

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Area of Science:

  • Neuroscience
  • Respiratory Physiology
  • Astrocyte Biology

Background:

  • Prostaglandin E2 (PGE2) released during hypercapnia influences respiratory networks.
  • The cellular source of PGE2 in the chemosensitive respiratory network was previously unknown.

Purpose of the Study:

  • To identify the source of PGE2 within the respiratory control center.
  • To investigate the role of astrocytes in respiratory rhythm modulation.

Main Methods:

  • Utilized transgenic mice with fluorescent reporters and specific receptors in astrocytes.
  • Performed time-lapse calcium imaging to monitor astrocytic and neuronal activity.
  • Activated specific astrocyte subtypes to observe downstream effects on calcium signaling and PGE2 release.

Main Results:

  • Identified a subpopulation of active astrocytes within the parafacial respiratory group (pFRG/RTN) forming a distinct subnetwork.
  • Activation of these astrocytes increased their calcium oscillation frequency and triggered local PGE2 release.
  • Astrocyte activation in pFRG/RTN doubled neuronal calcium oscillation frequency and blunted the hypercapnic ventilatory response.

Conclusions:

  • Astrocytes in the pFRG/RTN are a source of PGE2.
  • Astrocytes actively modulate respiratory rhythm and behavior through PGE2 signaling.
  • This study highlights a novel mechanism of respiratory control involving astrocyte-neuron interactions.