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Related Concept Videos

Factors Affecting Pulmonary Ventilation01:19

Factors Affecting Pulmonary Ventilation

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Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
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Breathing, otherwise known as pulmonary ventilation, is the process of air movement into and out of the lungs. The main mechanisms propelling pulmonary ventilation are atmospheric pressure (Patm), intra-pulmonary (Ppul ) or intra-alveolar pressure (Palv) within the alveoli, and intrapleural pressure (Pip) within the pleural cavity.
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The process of breathing, inhaling and exhaling, involves the coordinated movement of the chest wall, the lungs, and the muscles that move them. Two muscle groups with important roles in breathing are the diaphragm, located directly below the lungs, and the intercostal muscles, which lie between the ribs. When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity and creating more room for the lungs to expand. When the intercostal muscles contract, the ribs...
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Pulmonary ventilation is a vital process that ensures the exchange of oxygen and carbon dioxide in the lungs. It refers to the movement of air into and out of the lungs, enabling the body to obtain oxygen and remove waste carbon dioxide. In this article, we will explore the intricacies of pulmonary ventilation, including its underlying principles, mechanisms, and the interplay of pressures within the respiratory system.
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Introduction to Inspiration: The Respiratory System in Action
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Mechanical interactions between adjacent airways in the lung.

Baoshun Ma1, Jason H T Bates

  • 1Department of Medicine, University of Vermont College of Medicine, Burlington, Vermont.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|February 1, 2014
PubMed
Summary

Lung mechanics show adjacent airways influence responsiveness. Computational models suggest parenchymal interactions are minimal between narrowing airways, especially in continuum models, indicating limited interdependence.

Keywords:
airway mechanicsfinite element modelmechanical heterogeneityparenchymal mechanicsspring network model

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Area of Science:

  • Pulmonary mechanics
  • Computational biology
  • Respiratory system modeling

Background:

  • Mechanical interdependence between lung airways and parenchyma significantly influences airway responsiveness.
  • The impact of adjacent airways on each other's narrowing due to parenchymal forces is not well understood.

Purpose of the Study:

  • To investigate how mechanical interactions between adjacent airways are mediated by the lung parenchyma.
  • To quantify the influence of one airway's narrowing on a neighboring airway's responsiveness.

Main Methods:

  • Development of a two-dimensional computational model simulating two airways within lung parenchyma.
  • Modeling the parenchyma using three distinct approaches: hexagonal spring network, triangular spring network, and elastic continuum.
  • Assessing airway narrowing interactions under varying degrees of airway contraction and separation.

Main Results:

  • Parenchymal interactions were negligible in continuum and triangular network models unless airways were within two diameters, with minimal effect.
  • The hexagonal spring network model predicted substantial airway-airway interactions, dependent on contraction forces and airway separation.
  • Current evidence favors the continuum model representation of lung parenchyma.

Conclusions:

  • Lung parenchyma, particularly when modeled as a continuum, does not significantly mediate interactions between narrowing airways.
  • The hexagonal spring network model's prediction of substantial interactions may not reflect in-vivo lung mechanics.
  • Adjacent airways likely exert limited mechanical influence on each other's narrowing in the lung.