Blood clots. Coloured scanning electron micrograph of occluded blood vessels in the human lung. The blood vessels can be seen with their lumens filled with clotted red blood cells. Fibrous tissue of the lung surrounds the blood vessels. Clots (thrombi) may develop due to a thrombosis occurring in the main blood vessel from which these smaller branches come. Thrombosis can occur where the inner wall of an artery or vein has been damaged. Occlusion (blockage) may seriously reduce blood flow, or stop it entirely. A danger is that part of the clot may break away, and lodge elsewhere. Magnification: x230 at 6x7cm size. x750 at 8x10ins

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