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Related Concept Videos

Chemical Factors Affecting Respiration Centers01:31

Chemical Factors Affecting Respiration Centers

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.
CO2 has a potent influence on respiration and is strictly regulated. Under...
Physiological Control of Respiration01:23

Physiological Control of Respiration

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.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
Other Factors Affecting Respiration Centers01:17

Other Factors Affecting Respiration Centers

Breathing is primarily an involuntary activity regulated by the brainstem respiratory centers. However, it can also be consciously controlled, allowing us to hold our breath or take deeper breaths when needed. This voluntary control is facilitated by the cerebral motor cortex, which bypasses the medullary centers to stimulate the respiratory muscles directly.
However, the ability to hold one's breath voluntarily is not limitless. When the CO2 concentration in the blood reaches a critical level,...
Toxidromes: Clinical Features01:30

Toxidromes: Clinical Features

Toxidromes are specific patterns of symptoms resulting from toxic substance exposure. They help in the identification and treatment of poisoning. The symptoms of each toxidrome group indicate poisoning by a certain class of chemicals or drugs.1. Sympathomimetic: Stimulates the sympathetic nervous system. Symptoms include agitation, increased heart rate (HR), blood pressure (BP), respiratory rate (RR), temperature, and pupil size. Drugs like cocaine and amphetamines, along with tremors and...
Acute Respiratory Failure-IV01:23

Acute Respiratory Failure-IV

Respiratory failure can manifest suddenly or gradually, characterized by a rapid decline in PaO2 and a rapid rise in PaCO2. This situation indicates a severe respiratory problem that may quickly become a life-threatening emergency. One of the early signs of hypoxemic Acute Respiratory Failure (ARF) is a change in mental status due to the brain's sensitivity to oxygen levels and changes in acid-base balance. Symptoms such as restlessness, confusion, and agitation suggest inadequate oxygen...
Alterations in Respiration II01:30

Alterations in Respiration II

There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...

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Automated Multimodal Stimulation and Simultaneous Neuronal Recording from Multiple Small Organisms
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Chemoreception and asphyxia-induced arousal.

Patrice G Guyenet1, Stephen B G Abbott

  • 1Department of Pharmacology, University of Virginia, Charlottesville, VA 22908, United States.

Respiratory Physiology & Neurobiology
|April 24, 2013
PubMed
Summary
This summary is machine-generated.

Arousal during sleep protects against asphyxia. This review explores how central respiratory chemoreceptors and specific brainstem pathways contribute to arousal from sleep during asphyxia.

Keywords:
Locus coerruleusOptogeneticsRapheRetrotrapezoid nucleusSleep apnea

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Area of Science:

  • Neuroscience
  • Respiratory Physiology
  • Sleep Medicine

Background:

  • Arousal from sleep is a critical protective mechanism against the dangers of asphyxia.
  • The precise sequence of neural events triggering arousal during asphyxia remains unclear.
  • Carotid bodies and central chemoreceptors are stimulated by asphyxia, but their roles in arousal are debated.

Purpose of the Study:

  • To review theoretical mechanisms of arousal from sleep.
  • To discuss the contribution of central respiratory chemoreceptors (CRCs) and other CO2-sensitive neurons to asphyxia-induced arousal.
  • To highlight the roles of the retrotrapezoid nucleus, raphe, and locus coeruleus in arousal.

Main Methods:

  • Literature review of anatomical and neurophysiological evidence.
  • Discussion of theoretical models of arousal.
  • Examination of optogenetic and other experimental tools used to study brainstem pathways.
  • Analysis of the function of C1 cells in breathing and arousal.

Main Results:

  • Evidence suggests that specific brainstem nuclei (retrotrapezoid nucleus, raphe, locus coeruleus) may mediate arousal independently of their respiratory control functions.
  • Hypoxia-sensitive C1 cells are implicated in both breathing regulation and arousal.
  • Optogenetic studies are providing new insights into the specific neural circuits involved.

Conclusions:

  • Central chemoreceptors and specific brainstem pathways play a crucial role in initiating arousal during asphyxia.
  • Understanding these pathways is vital for comprehending protective sleep responses.
  • Further research using advanced tools is refining our knowledge of these complex mechanisms.