Abstract
Avian respiratory systems consist of the cyclic structure involving some organs called by air sac. The birds ventilating with air sacs has uni-directional flow in the gas exchange bronchus. Here, it is thought that aerodynamic valve creating uni-directional flows because the mechanical valve not exist in the lungs. It is confirmed that similar flow exist in the lungs of reptiles, but there are still many questions about the generating factor about the uni-directional flow. In this report, we have inspected the influence that air sacs give the uni-directional flow by analyzing the avian respiratory system using the lumped parameter model. Based on the analysis result, we consider a process of the avian lungs evolution.
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