# TranspMM.1sided.Distrib2F

An axially distributed two region model with a two-sided passive transporter (PSg) through clefts and a one-sided Michaelis-Menten transporter (PSc) for membrane transport.

Model number: 0016

### Further reading: Distributed Blood Tissue Exchange Models Explained Download PDF file.

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## Description

When both PSg and PScmax are > 0 and Kmc >> Cp, and there is no back
diffusion, then the envelope of C(t,x) is given by

C(x) = (Peak Height of the input curve)*exp(-(PSg+PScmax)*x/(Fp*L)).

This is an axially distributed 2-region capillary-tissue exchange model with permeation across the capillary wall via clefts (PSg) and cell transporters (PSc). The capillary plasma region has volume Vp, flow Fp, first order consumption Gp, and axial diffusion Dp. Units are physiological (i.e. per gram of tissue) so that this can represent a homogeneously perfused organ. Radial diffusion is assumed instantaneous (short radial distances). This interstitial fluid region, isf, has volume Visf, first order consumption Gisf, and axial diffusion Disf. Capillary-tissue exchange is modeled by two parallel routes:

1. PSg: Passive exchange between plasma and surrounding non-flowing interstitial fluid is through interendothelial clefts. PSg is Permeability-Surface area product.

2. PSc: Facilitated transport occurs via a transporter on the capillary membrane with PScmax as maximal conductance at low concentrations. Transporter is modified from TranspMM.1sided.Distrib2F--facilitated transport can go either way.

## Equations

#### One-sided Saturable Transporter Equation

#### Differential Equations

#### Left Boundary Conditions

, .#### Right Boundary Conditions

, , .#### Initial Conditions

, or, .

The equations for this model may also 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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## References

Sangren WC and Sheppard CW. A mathematical derivation of the exchange of a labeled substance between a liquid flowing in a vessel and an external compartment. Bull Math Biophys 15: 387-394, 1953 (This gives an analytic solution for the two-region model.) Goresky CA, Ziegler WH, and Bach GG. Capillary exchange modeling: Barrier-limited and flow-limited distribution. Circ Res 27: 739-764, 1970. (This gives another derivation of the analytical form, and uses the model in both single and multicapillary models. Bassingthwaighte JB. A concurrent flow model for extraction during transcapillary passage. Circ Res 35: 483-503, 1974. (This gives numerical solutions, which are faster than the analytic solutions, and embeds the model in an organ with tissue volums conserved, and with arteries and veins. The original Lagrangian sliding fluid element model with diffusion.) Guller B, Yipintsoi T, Orvis AL, and Bassingthwaighte JB. Myocardial sodium extraction at varied coronary flows in the dog: Estimation of capillary permeability by residue and outflow detection. Circ Res 37: 359-378, 1975. (Application to sodium exchange in the heart.) Goresky CA. Hepatic membrane carrier transport processes: Their involvement in bilirubin uptake. In: Chemistry and Physiology of Bile Pigments. Washington, D.C.: Publishing House U.S. Government, 1977, p. 265-281. Silverman M and Goresky CA. A unified kinetic hypothesis of carrier-mediated transport: Its applications. Biophys J 5: 487-509, 1965.

## Related Models

- Two sided 2 compartment.
- Two sided 2 compartment with flow.
- Two sided 3 region, 2 transporters with flow.

## Key Terms

## Model History

Get Model history in CVS.## Acknowledgements

Please cite **www.physiome.org** 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.

[This page was last modified 13Jul10, 12:47 pm.]

**Model development and archiving support at
physiome.org provided by the following grants:** 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.