How we manage the clotting of blood

Having studied the mechanisms clotting, science is now able to influence this process. For example, if you want to keep the blood transfusion, not to give it to clot, you can, on the one hand, to place it in the banks with specially treated, smooth walls (this will slow down the destruction of blood platelets), on the other - to remove calcium ions by adding acid, which calcium gives insoluble salt precipitated (for example, citric acid). Finally, you can add a substance that neutralizes the action of the enzyme thrombin, if he was already formed. These are produced by the liver and in small amounts present in human blood heparin (from the Greek. hepar - liver), and allocated leech hirudin (from lat. hirudo - leech). This substance allows leeches long time to suck from a wound fluid, nesvertawateisa blood.
If a person has a blood clotting raised and he faces a blood clot inside the vessel, the so-called thrombosis, can be given drugs that reduce production by the liver protrombina. These drugs are called anticoagulants. These include dikumarina, syncumar etc. If, on the contrary, it is necessary to raise coagulability, you can give the substance, enhanced release of protrombina liver. Such action has, for example, vitamin K (contained in cabbage, spinach, carrots). You must also enter the body calcium ions (in the form of a solution of calcium chloride and so on).
To stop a strong local bleeding in the USSR proposed powerfully acting drugs thrombin.