An enzyme liberated from blood platelets that converts prothrombin into thrombin as blood starts to clot, also called thrombokinase.
Substance called Factor III in blood and tissues that accelerates clotting.
A substance present in tissues, platelets, and leukocytes that, in the presence of Ca++, brings about the conversion of prothrombin to thrombin and thence the formation of a clot.
Substance found in most tissues and some blood cells that starts the blood coagulation process, converting prothrombin to thrombin.
A substance formed during the earlier stages of blood coagulation. It acts as an enzyme, converting the inactive substance prothrombin to the enzyme thrombin.
Also known as thrombokinase, this is an enzyme formed in the preliminary stages of the coagulation of blood. It converts the inactive prothrombin into the enzyme thrombin.
Blood coagulation factor (III), a substance found in both blood and tissues. It accelerates the clotting of blood.
An enzyme present in the bloodstream that facilitates the conversion of prothrombin into thrombin.
A substance that induces clotting in blood that has been shed.