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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...
Respiratory Regulation of Acid-Base Balance01:18

Respiratory Regulation of Acid-Base Balance

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.
When carbon dioxide levels increase in the blood, more H+ and HCO3⁻ are produced, leading to a...
Physiology of Respiration II: Neurogenic Control of Respiration01:22

Physiology of Respiration II: Neurogenic Control of Respiration

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:
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,...
Neural Control of Respiration01:18

Neural Control of Respiration

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.
Respiratory Centers in the Brainstem
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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Electrophysiology on Isolated Brainstem-spinal Cord Preparations from Newborn Rodents Allows Neural Respiratory Network Output Recording
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Task2 potassium channels set central respiratory CO2 and O2 sensitivity.

Christian Gestreau1, Dirk Heitzmann, Joerg Thomas

  • 1Department of Neurovegetative Physiology, Centre National de la Recherche Scientifique, Université Paul Cézanne, 13397 Marseille, France.

Proceedings of the National Academy of Sciences of the United States of America
|February 6, 2010
PubMed
Summary

Task2 channels are crucial for respiratory control in mice, regulating breathing in response to CO2 and oxygen levels. Loss of Task2 disrupts central chemoreception, impacting breathing stability.

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Area of Science:

  • Neuroscience
  • Respiratory Physiology

Background:

  • Task2 K(+) channels are found in specific brainstem nuclei like the retrotrapezoid (RTN) region.
  • Congenital central hypoventilation syndrome (CCHS) in humans is linked to Phox2b mutations affecting RTN neurons.

Purpose of the Study:

  • To investigate the role of Task2 channels in central chemoreception and respiratory regulation.
  • To determine the function of Task2 in RTN neurons and their contribution to breathing control.

Main Methods:

  • Utilized Task2 knockout (Task2(-/-)) mice and plethysmography to assess respiratory function.
  • Examined chemosensory responses to varying CO2 concentrations and hypoxia.
  • Investigated respiratory responses in an isolated brainstem-spinal cord preparation.

Main Results:

  • Task2(-/-) mice exhibited hypersensitivity to low CO2, leading to hyperventilation.
  • These mice also lost the long-term hypoxia-induced respiratory decrease, while acute responses were intact.
  • The absence of anoxia-induced respiratory depression in isolated preparations indicated a central origin.

Conclusions:

  • Task2 channels are essential determinants of central O2 chemoreception.
  • Task2 likely stabilizes the membrane potential of chemoreceptive RTN neurons.
  • Hypoxia-induced reactive oxygen species may silence RTN neurons via Task2, contributing to respiratory depression.