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Related Concept Videos

Mechanism of Breathing I: Inspiration01:30

Mechanism of Breathing I: Inspiration

Introduction to Inspiration: The Respiratory System in Action
The respiratory system, an essential network for breathing, comprises the conducting and respiratory zones, each playing a crucial role in the overall process of respiration. Let us explore the detailed mechanism of inspiration, or inhalation, which is the first phase of the respiratory cycle.
Pathway of Air during Inspiration
During inspiration, air enters our body through the nose or mouth and moves through the conducting zone,...
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...
COPD: Pathogenesis and Clinical Features01:20

COPD: Pathogenesis and Clinical Features

Chronic obstructive pulmonary disease (COPD) is a group of lung conditions that progressively worsen over time, including chronic bronchitis and emphysema. This cluster of diseases collectively leads to a gradual and irreversible decline in lung function over time.
The primary cause for the onset of COPD is cigarette smoking and exposure to air pollution. These hazardous factors initiate a chain reaction within the lungs, resulting in chronic inflammation, damage to the airways, and a...
Physiology of Respiration I: Functions of the Respiratory System01:27

Physiology of Respiration I: Functions of the Respiratory System

The respiratory system is crucial for exchanging oxygen (O2) and carbon dioxide (CO2) between the atmosphere and the bloodstream, maintaining the body's balance. Beyond gas exchange, it helps regulate acid-base balance, purify inhaled air, and enable vocalization.
Fundamental Processes in Respiration:
Chronic Obstructive Pulmonary Disease-II: Pathophysiology01:20

Chronic Obstructive Pulmonary Disease-II: Pathophysiology

Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
Chronic Inflammation
Atelectasis II: Pathophysiology01:10

Atelectasis II: Pathophysiology

Atelectasis develops when alveoli lose their air and collapse inward. Because lung tissue is naturally elastic, these air sacs shrink rather than remaining open. Collapsed alveoli are no longer ventilated, reducing their role in gas exchange. Blood flow may continue in these regions, creating a ventilation–perfusion mismatch. Clinical findings include decreased breath sounds, dullness to percussion, reduced chest expansion, and decreased tactile fremitus as sound transmission through collapsed...

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Updated: Jun 23, 2026

Evaluation of Respiratory System Mechanics in Mice using the Forced Oscillation Technique
13:10

Evaluation of Respiratory System Mechanics in Mice using the Forced Oscillation Technique

Published on: May 15, 2013

Dyspnea: physiological and pathophysiological mechanisms.

K Wasserman1, R Casaburi

  • 1Division of Respiratory and Critical Care Physiology and Medicine, Harbor-UCLA Medical Center, Torrance 90509.

Annual Review of Medicine
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

Dyspnea, or breathlessness, occurs when breathing demand exceeds capacity, often signaled by rapid breathing (tachypnea). New monitoring tools aid in understanding the mechanisms behind this sensation.

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Area of Science:

  • Respiratory Physiology
  • Clinical Medicine
  • Neuroscience

Background:

  • Dyspnea is a subjective sensation of breathlessness, a common symptom in various cardiopulmonary conditions.
  • Tachypnea, or rapid breathing, is the primary physical sign associated with dyspnea.
  • Understanding the pathophysiological mechanisms of dyspnea is crucial for patient management.

Purpose of the Study:

  • To review the mechanisms of exercise ventilation and their link to dyspnea.
  • To discuss methods for quantifying dyspnea and the stimuli that produce it.
  • To explore the central nervous system's role in dyspnea perception.

Main Methods:

  • Review of literature on exercise ventilation, dyspnea stimuli, and underlying disorders.
  • Discussion of psychophysical testing and questionnaires for dyspnea assessment.
  • Analysis of case studies involving brain stem lesions and dyspnea perception.

Main Results:

  • New developments in ventilation monitoring during exercise enhance the evaluation of dyspnea.
  • Various stimuli can produce dyspnea through complex pathophysiological pathways.
  • The central nervous system, likely in the brain stem, integrates signals contributing to the sensation of dyspnea.

Conclusions:

  • Dyspnea results from an imbalance between ventilatory demand and capacity.
  • The perception of dyspnea is a complex neurological process.
  • Further research into brain stem function may elucidate specific dyspnea mechanisms.