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Related Concept Videos

Physiology of Respiration I: Functions of the Respiratory System01:27

Physiology of Respiration I: Functions of the Respiratory System

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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.
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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.
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Altered states of consciousness represent significant deviations from one's normal mental state. These deviations can range from subtle changes in awareness to profound transformations in perception, thought processes, and sensory experiences. Altered states of consciousness can be triggered by various factors, including drug use, meditation, hypnosis, illness, or even intense fatigue.
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The respiratory system is comprised of the organs that enable breathing. Air enters the nostrils and mouth, followed by the pharynx (throat) and larynx (voice box), which lead to the trachea (windpipe). In the thoracic cavity, the trachea splits into two bronchi that allow air to enter the lungs. The bronchi split into progressively smaller bronchioles and terminate in small groups of tiny sacs in the lungs called alveoli, where gas exchange occurs.
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Nasopharyngeal suctioning is a procedure to remove secretions from the upper part of the respiratory tract that the patient cannot clear independently. It helps maintain airway patency and prevents complications such as aspiration pneumonia.
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Related Experiment Video

Updated: Feb 14, 2026

Assessment of Respiratory Function in Conscious Mice by Double-chamber Plethysmography
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Repeated airway constrictions in mice do not alter respiratory function.

Samuel Mailhot-Larouche1, Louis Deschênes1, Morgan Gazzola1

  • 1Quebec Heart and Lung Institute, Université Laval , Quebec, QC , Canada.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|February 23, 2018
PubMed
Summary

Repeated methacholine-induced airway constrictions in mice caused goblet cell hyperplasia and inflammation but did not alter respiratory mechanics or airway smooth muscle function. These findings suggest methacholine challenges are safe.

Keywords:
airway hyperresponsivenessairway remodelingasthmabronchoconstrictionrespiratory mechanicsspecific airway resistance

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Area of Science:

  • Respiratory physiology
  • Pulmonary medicine
  • Asthma research

Background:

  • Asthma involves airway remodeling due to repeated smooth muscle constrictions.
  • The impact of such constrictions on respiratory mechanics in non-asthmatic individuals is unknown.

Purpose of the Study:

  • To investigate if repeated airway constrictions induce asthma-like features in mice without asthma.
  • To assess the effects on respiratory mechanics and airway wall remodeling.

Main Methods:

  • BALB/c mice underwent repeated methacholine-induced airway constrictions over 6 weeks.
  • Respiratory system mechanics were evaluated using flexiVent.
  • Inflammation, smooth muscle contractile capacity, and airway wall structure were assessed.

Main Results:

  • Repeated constrictions increased goblet cell numbers and macrophage counts in lung lavage.
  • Respiratory system resistance and compliance, Newtonian resistance, and lung tissue properties remained unaffected.
  • Airway smooth muscle contractile capacity and overall airway wall structure showed no significant changes.

Conclusions:

  • Despite inducing goblet cell hyperplasia and mild inflammation, repeated methacholine constrictions do not lead to adverse physiological changes in mice.
  • These findings suggest that repeated methacholine challenges may be safe in this model and provide insight into asthma remodeling debates.