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Description: This 3D medical animation shows how bruising occurs. Larger bruises may change color due to the breakdown of hemoglobin from within red blood cells that have escaped from the vessels into the extracellular space. The striking colors of a bruise are caused by the phagocytosis and sequential degradation of hemoglobin to biliverdin to bilirubin to hemosiderin, with hemoglobin itself producing a red-blue color, biliverdin producing a green color, bilirubin producing a yellow color, and hemosiderin producing a golden-brown color. As these products are cleared from the area, the bruise disappears.

Last Updated: Jan 20th, 2019