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Factor XIII, or fibrin stabilizing factor, is a plasma protein and zymogen. It is activated by thrombin to factor XIIIa which crosslinks fibrin in coagulation. Deficiency of XIII worsens clot stability and increases bleeding tendency. [1] Human XIII is a heterotetramer. It consists of 2 enzymatic A peptides and 2 non-enzymatic B peptides.
The coagulation factors are generally enzymes called serine proteases, which act by cleaving downstream proteins. The exceptions are tissue factor, FV, FVIII, FXIII. [28] Tissue factor, FV and FVIII are glycoproteins, and Factor XIII is a transglutaminase. [27] The coagulation factors circulate as inactive zymogens. The coagulation cascade is ...
The last category, alterations in the constitution of blood, [6] has numerous possible risk factors such as hyperviscosity, coagulation factor V Leiden mutation, coagulation factor II G2021A mutation, deficiency of antithrombin III, protein C or S deficiency, nephrotic syndrome, changes after severe trauma or burn, cancer, late pregnancy and ...
FXIIa's cleavage of FXI initiates coagulation. In the contact activation system or CAS, three proteins in the blood, factor XII (FXII), prekallikrein (PK) and high molecular weight kininogen (HK), bind to a surface and cause blood coagulation and inflammation. FXII and PK are proteases and HK is a non-enzymatic co-factor
Hemostasis occurs when blood is present outside of the body or blood vessels. It is the innate response for the body to stop bleeding and loss of blood. During hemostasis three steps occur in a rapid sequence. Vascular spasm is the first response as the blood vessels constrict to allow less blood to be lost.
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Thrombosis (from Ancient Greek θρόμβωσις (thrómbōsis) 'clotting') is the formation of a blood clot inside a blood vessel, obstructing the flow of blood through the circulatory system. When a blood vessel (a vein or an artery) is injured, the body uses platelets (thrombocytes) and fibrin to form a blood clot to prevent blood loss ...
Insulin-like growth factor 1, a polypeptide protein hormone which plays an important role in childhood growth and continues to have anabolic effects in adults Thrombopoietin , a glycoprotein hormone that regulates the production of platelets by the bone marrow
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