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Pneumonia and Adult Respiratory Distress Syndrome (ARDS). Shows lungs within the chest, identifying the terminal alveoli where the disease begins.  Subsequent graphics show progression of ARDS: 1. Normal anatomy of the alveoli with normal gas exchange; 2. Pneumonia with thickening of the alveolar wall and accumulation of mucus within the alveolar sac; 3. Pneumonia and ARDS showing final disruption of gas exchange due to foreign fluid.