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Blood disorders can affect any of the three main components of blood: 1  Red blood cells, which carry oxygen to the body's tissues. 2  White blood cells, which fight infections. 3  Platelets, which help blood to clot.
Blood Clots (Arterial & Venous) Overview Blood clotting can be and is a very important natural process in which platelets, fibrin, blood cells and various components of blood clump together to stop bleeding after a blood vessel or your skin has been injured.