(4/8) Stochastic Model

• The lung is inflated by:

• • • (a) Reducing the volume of the piston.
    • (b) Reducing the pressure of the chamber;

• Airways have finite flow resistance, R;

• Alveoli have viscoelastic walls, C;

• Initially, all airways are closed with liquid bridges;

• Airways have a random opening threshold pressure, Pth .

• Air in the lung is a perfect gas: PV = nRT.