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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.
Definition. 1  A blood clot is a thickened mass in the blood formed by tiny substances called platelets. Clots form to stop bleeding, such as at the site of cut. 2  As soon as a blood vessel wall is damagedâby a cut or similar traumaâa series of reactions normally takes place to activate platelets to stop the bleeding.