JOHN BURBIDGE / SCIENCE PHOTO LIBRARY JOHN BURBIDGE / SCIENCE PHOTO LIBRARY
Lung infarction. Light micrograph of a section through an infarction in a human lung. The dark red colour is caused by congestion of alveoli (tiny air spaces) with blood, as seen at upper left. Necrosis, or tissue death, has destroyed many of the alveoli (lower left) leaving large cavities. Infarction is the death of an area of tissue caused by inadequate blood supply (ischaemia). Lung infarctions often occur as a result of pulmonary embolism, where a small body carried through the bloodstream lodges in the lungs, obstructing blood flow. Magnification: x20 at 6x9cm size.
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