Resin cast of the lungs displaying the branching out of bronchi, in addition to the pulmonary arteries and trachea. The bronchi and pulmonary arteries work together in using inhaled air to oxygenate blood and exhale carbon dioxide. Photograph by Martin Dohrn.
This is a photograph of a smoker’s lung suffering from emphysema at 4x magnification. The light spots are regions where light shines through the lung, while the black regions reveal carbon accumulations.