The gelatinous material formed to stem the flow of blood when a blood vessel is injured. Normally, the lining of a blood vessel wallows the blood to flow without any change in its chemistry ;however, when a blood vessel is ruptured and the blood comes into contact with foreign tissue,clotting begins .Platelets in the blood, triggered by the contact involving a number of protein constituents in the blood, ending with the conversion of fibrinogen, soluble material ,to fibrin, that is insoluble. The fibrin is laid down in fine strands that collect white and red cells to form a clot.
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