Model number


Periodic airway transport and alveolus-capillary gas exchange.


 A homogeneous model for respiratory gas exchange is presented. It contains an alveolar sac (compartment) 
 connected to a 1D airway (cylinder). The alveolar sac exchanges species with a capillary 
 (cylinder) through a single layer. The model can predict time dependent airway concentration 
 profiles in the presence of bidirectional air flow over a single or multiple breath time 
 span. Source of species can be set either in air or in blood. 	


homogenousExch pic1




The equations for this model may be viewed by running the JSim model applet and clicking on the Source tab at the bottom left of JSim's Run Time graphical user interface. The equations are written in JSim's Mathematical Modeling Language (MML). See the Introduction to MML and the MML Reference Manual. Additional documentation for MML can be found by using the search option at the Physiome home page.

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 Hlastala MP, A Model of Fluctuating Alveolar Gas Exchange During the Respiratory Cycle. 
 Respir. Physiol. 15: 214-232, 1972 	
Key terms
gas exchange
alveolar exchange
pulmonary circulation
bronchial circulation
pulmonary capillaries
alveolar sac

Please cite https://www.imagwiki.nibib.nih.gov/physiome in any publication for which this software is used and send one reprint to the address given below:
The National Simulation Resource, Director J. B. Bassingthwaighte, Department of Bioengineering, University of Washington, Seattle WA 98195-5061.

Model development and archiving support at https://www.imagwiki.nibib.nih.gov/physiome provided by the following grants: NIH U01HL122199 Analyzing the Cardiac Power Grid, 09/15/2015 - 05/31/2020, NIH/NIBIB BE08407 Software Integration, JSim and SBW 6/1/09-5/31/13; NIH/NHLBI T15 HL88516-01 Modeling for Heart, Lung and Blood: From Cell to Organ, 4/1/07-3/31/11; NSF BES-0506477 Adaptive Multi-Scale Model Simulation, 8/15/05-7/31/08; NIH/NHLBI R01 HL073598 Core 3: 3D Imaging and Computer Modeling of the Respiratory Tract, 9/1/04-8/31/09; as well as prior support from NIH/NCRR P41 RR01243 Simulation Resource in Circulatory Mass Transport and Exchange, 12/1/1980-11/30/01 and NIH/NIBIB R01 EB001973 JSim: A Simulation Analysis Platform, 3/1/02-2/28/07.