Heparin vs E.D.T.A.

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Heparin and EDTA are anticoagulants that are used for preventing the blood from clotting,however the ones that we find in the body is Heparin while others are made from different salts. Now, i want to know the effects that the two antigoagulants have on the blood when working externally,assuming the enviromental conditions are thesame.What causes coagulation and dialation?