Spherical Chicken (IMAGE) New York University Caption A "spherical chicken" approximation to the bird lung showing how the back-and-forth air motions during inhalation (blue arrows) and exhalation (red) lead to one-way flow (purple) around the loop. The mechanism relies on flows near the junctions in the lung network and especially the marked difference during the phases of breathing. Credit NYU's Applied Mathematics Laboratory Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.