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Key Facts In This Video
Bruises change colors because of hemoglobin, the compound in red blood cells that brings oxygen to your body. 00:19
Broken capillaries under the surface of where you were injured make the outside of your skin appear bluish-black. 00:30
Bilirubin is what turns bruises yellow. Bilirubin is waste we excrete, and is what gives urine its yellow color. 01:00
Sometimes, bruises move downward because gravity is pulling the debris in that direction. 01:24
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