Rat lung alveolus

3-D reconstruction of rat lung alveolus perfused with a synthetic hemoglobin solution (red) under conditions of high inflation pressure . Such pressures exclude red cells from alveoli, but the acellular solution nearly fills the alveolus shown. These solutions could improve oxygenation in trauma patients, for whom high lung inflation pressures are a necessity. (The image was modified using VoxBlast (Vaytek, Inc.). Robert Conhaim, 1999

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