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Related Concept Videos

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,...
Mechanism of Breathing II: Expiration01:23

Mechanism of Breathing II: Expiration

The Physiology of Expiration: A Seamless Respiratory Process
Expiration, or exhaling, is a complex physiological process that begins as the inspiratory muscles begin to relax. This relaxation triggers a series of events that epitomize the efficiency of the respiratory system.
Mechanism of Expiration:
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:
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...
Hyperpnea and Hyperventilation01:25

Hyperpnea and Hyperventilation

Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...

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Custom Smartphone Application to Guide Locomotor-Respiratory Coupling in the Field Using Step-Adaptive Breathing Sounds
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Control of breathing during exercise.

Hubert V Forster1, Philippe Haouzi, Jerome A Dempsey

  • 1Medical College of Wisconsin, Department of Physiology, Milwaukee, Wisconsin, USA. bforster@mcw.edu

Comprehensive Physiology
|June 4, 2013
PubMed
Summary
This summary is machine-generated.

The precise control of breathing during exercise remains elusive. Current evidence suggests exercise hyperpnea is not directly driven by gas exchange but linked to common circulatory and ventilatory factors, with central command playing a potential, yet unproven, role.

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Area of Science:

  • Exercise Physiology
  • Respiratory Control
  • Mammalian Physiology

Background:

  • Alveolar ventilation and diffusion match metabolic rate during exercise to maintain blood gases.
  • The mechanism sensing gas exchange for respiratory control is unknown, posing a century-old question.
  • Existing hypotheses for exercise hyperpnea regulation lack conclusive evidence.

Purpose of the Study:

  • Critically evaluate major hypotheses explaining exercise-induced hyperpnea.
  • Identify the primary drivers and regulatory mechanisms of respiratory adjustments during physical activity.
  • Clarify the relationship between metabolic rate, circulatory function, and ventilation.

Main Methods:

  • Literature review and critical analysis of existing hypotheses.
  • Examination of data supporting and refuting proposed mechanisms for respiratory control during exercise.
  • Evaluation of the role of various potential stimuli, including chemoreceptors and central command.

Main Results:

  • No single stimulus fully explains exercise hyperpnea; coupling to metabolic rate is indirect, linked by a common factor.
  • Pulmonary, cardiac, and central chemoreceptors are unlikely primary mediators.
  • Spinal afferents from exercising limbs and central command are implicated but lack definitive proof.

Conclusions:

  • The regulation of exercise hyperpnea is complex and multifactorial.
  • The direct causal link between metabolic rate and ventilation is questioned.
  • Central command's role is plausible but requires more robust evidence for confirmation.