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Related Concept Videos

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...
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...
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:
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...
Gross Anatomy of the Lungs01:17

Gross Anatomy of the Lungs

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...
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...

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Cardio-respiratory coupling depends on the pons.

Thomas E Dick1, David M Baekey, Julian F R Paton

  • 1Division of Pulmonary, Critical Care and Sleep Medicine, Department of Medicine, Case Western Reserve University, Biomedical Research Bldg., BRB 319, 10900 Euclid Avenue, Cleveland, OH 44106-4941, USA. ted3@po.cwru.edu

Respiratory Physiology & Neurobiology
|August 1, 2009
PubMed
Summary

Cardio-respiratory coupling involves reciprocal neural control. The vagus nerve influences pontine nuclei activity, impacting breathing and arterial pulse pressure, crucial for gas exchange.

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Area of Science:

  • Neuroscience
  • Cardiovascular Physiology
  • Respiratory Physiology

Background:

  • Cardio-respiratory coupling is a reciprocal interaction between the cardiovascular and respiratory systems.
  • This coupling is evident in respiratory-modulated sympathetic nerve activity and pulse-modulated respiratory motor activity.
  • Brainstem neuraxis, extending to the dorsolateral pons, controls cardio-respiratory functions.

Purpose of the Study:

  • To investigate the convergence of cardio-respiratory control systems in the pons.
  • To examine the role of pontine nuclei in modulating heart rate, blood pressure, and breathing.
  • To demonstrate vagal influence on pontine activity related to arterial pulse pressure and phrenic nerve activity.

Main Methods:

  • Electrophysiological recordings in decerebrate cats.
  • Analysis of dorsolateral pontine neuronal activity.
  • Modulation assessment with intact and vagotomized conditions, analyzing arterial pulse pressure and respiratory patterns.

Main Results:

  • Dorsolateral pontine activity showed weak modulation by arterial pulse pressure and respiratory pattern with intact vagi.
  • Bilateral vagotomy significantly increased the strength and consistency of respiratory modulation in pontine neurons.
  • Arterial pulse pressure modulation strength and consistency did not significantly change overall after vagotomy, with mixed individual neuron responses.

Conclusions:

  • The vagus nerve significantly shapes the neural activity envelope related to both respiratory and cardiac cycles.
  • These findings provide insight into the neural basis of vagal effects on cardio-respiratory coupling, including respiratory sinus arrhythmia.
  • Data support the convergence of neural inputs controlling breathing and cardiovascular functions, though the precise physiological role in tissue oxygenation remains hypothetical.