any of several plasma components (such as fibrinogen, prothrombin, thromboplastin, and factor VIII) that are involved in the clotting of blood, group of substances present in blood plasma that, under certain circumstances, undergo a series of chemical reactions leading to the conversion of blood from a liquid to a solid state, hüübi­mis­protsessi käivitamises osalevad verevalgud ning kaltsium­iioon