World Library  
Flag as Inappropriate
Email this Article

Respiratory physiology

Article Id: WHEBN0003163812
Reproduction Date:

Title: Respiratory physiology  
Author: World Heritage Encyclopedia
Language: English
Subject: Pulmonary compliance, Airway resistance, Ventilation/perfusion ratio, Respiratory physiology, Pulmonary stretch receptors
Collection: Respiratory Physiology
Publisher: World Heritage Encyclopedia

Respiratory physiology

Gaseous exchange in the lung.

Respiratory physiology is the branch of human physiology focusing upon respiration.

Topics include:


  • Volumes 1
  • Mechanicism 2
  • Circulation, ventilation, and perfusion 3
  • Gas exchange/transport (primarily oxygen and carbon dioxide) 4
  • Control and response 5
  • Disorders 6
  • See also 7
  • Additional images 8
  • References 9
  • External links 10



Front view of thorax.

Inhalation (breathing in) is usually an active movement. The contraction of the diaphragm muscles causes the thoracic cavity to increase in volume, thus decreasing the pressures within the lung (Intrapleural and Alveolar Pressures). This negative pressure within the lungs acts as a Pressure Gradient, thus pulling air into the lungs. As air fills the lungs, the negative alveolar pressure moves back towards atmospheric pressure, and air flow into the lungs slows down. In contrast, expiration (breathing out) is usually a passive process.

\begin{align} P &= P_{el} + P_{re} + P_{in} \\ P &= EV + R\dot{V} + I\ddot{V} \end{align}

Where Pel equals the product of elastance E (inverse of compliance) and volume of the system V, Pre equals the product of flow resistance R and time derivate of volume V (which is equivalent to the flow), Pin equals the product of inertance I and second time derivate of V. R and I are sometimes referred to as Rohrer's constants.

Circulation, ventilation, and perfusion

Pulmonary circulation

Gas exchange/transport (primarily oxygen and carbon dioxide)

Oxygen-hemoglobin dissociation curve

Control and response



See also

Additional images


  1. ^ Compliance

External links

  • Clinical Sciences - Respiratory An iPhone app covering detailed respiratory physiology and anatomy
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.