.Physiomodel.Water.WaterCompartments.GI_Absorption

Information

QHP 2008 / GILumenH2O.REF



Volume ========================================

Typical lumen volume is 1000 mL on an intake of 1.4 mL/Min.
This number is based on lumen volume being 1.4% body weight
from

   JCI 36:289-296, 1957.

Data suggests a 1L oral load is nearly all absorbed in
1 Hr.  Average rate would be 17 mL/Hr with a peak rate
of about 30.

   Baldes & Smirk. J.Physiol. 82:62,1934.

Osmolar gradient is assumed to be 0.200 mOsm/mL.

   Rate = Perm * Grad
   30 = Perm * 0.200
   Perm = 150

Temperature ===================================

Typical lumen heat content is 155 kCal.

Specific heat (SH) of H2O is 0.001 (kCal/G)/DegK.

To get temperature from heat

   DegK = 1000.0 * kCal/G (or mL)
   DegC = DegK - 273.15
   DegF = ( 9 / 5 ) * DegC + 32

To get heat from temperature

   kCal = 0.001 * DegK * mL
   kCal/Min = 0.001 * DegK * mL/Min

Revisions

• january 2009
  by Marek Matejak in Modelica initially implemented (consulted with Jiri Kofranek), Charles University, Prague
  orginaly described by Tom Coleman in QHP 2008 beta 3, University of Mississippi Medical Center