Fig 2. Lung, chest wall, and total respiratory system compliance curves for high C_w (left) and low C_w (right).

Curves are described by Eqs (9) and (10) and parameterized using the procedures described in Parameterization. Tidal breathing loops with normal R_u (grey) and increased R_u (black) are superimposed for each condition over the lung compliance curve and larger in each inset to display hysteresis.