Abstract
The epithelial transport system is a thermodynamic system which is composed of membranes and fluid compartments. I regard membrane to be dissipative subsystem in which power dissipates, and fluid compartment to be capacitive subsystem in which power is stored. Each subsystem can be subdivided into elementary processes, and can be modeled by generalized capacitor, power transducer and resistor in a bond graph. For this modeling, I consider causality of dissipative process and devise a representation of power coupling in a dissipative subsystem. A membrane transport can be modeled by a combination of these subsystems. I can derive the phenomenological equation with concrete parameters from the model of the dissipative subsystem.
