Robust Unidirectional Airflow through Avian Lungs: New Insights from a Piecewise Linear Mathematical Model
Fig 2
The resistances R1 and R2 are discontinuous and depend on the flow direction.
A: The resistance R1 is discontinuous at P1 = PJ, which is when q1 = 0. For q1 > 0, R1 = R1,insp, while for q1 < 0, R1 = R1,exp ≥ R1,insp. B: The resistance R2 is discontinuous at P2 = PJ, which is when q2 = 0. For q2 > 0, R2 = R2,exp, while for q2 < 0, R2 = R2,insp ≥ R2,exp.