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Physical Review Letters – 13 February 2004
Volume 92, Issue 6

The cubical structure shown is a Kitaoka model of a human subacinus, the terminal diffusion cell in the lung. This model reproduces the topological complexity of real subacini and is used in a numerical study of the concentration and diffusion of oxygen (red through blue areas) to show that only about 1/3 of the total alveolar surface is active in normal breathing. [M. Felici, M. Filoche, and B. Sapoval, Phys. Rev. Lett. 92, 068101 (2004)]

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