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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.
The strands of fibrin form a meshwork and trap blood cells and platelets which form into a solid clot. If a blood clot forms within a healthy blood vessel it can cause serious problems. So, there are also chemicals in the blood that prevent clots from forming and chemicals that 'dissolve' clots.There is balance between forming clots and preventing clots.lotting disorders. Sometimes a blood clot forms within a blood vessel that has not been injured or cut-for example: 1  A blood clot that forms within an artery supplying blood to the heart or brain is the common cause of heart attack and stroke.