Question

Who prevents transformation of prothrombin into thrombin in uninjured blood vessel?

• A. Heparin
• B. Soluble fibrin
• C. XIII a factor
• D. Thromboplastinogenase

Answer 1

The correct option is A Heparin

Heparin is an anticoagulant, which prevents the conversion of prothrombin into thrombin. The molecular basis for the anticoagulant action of heparin lies in its ability to bind to and enhance the inhibitory activity of the plasma protein anti-thrombin against several serine proteases of the coagulation system, most importantly factors IIa (thrombin), Xa and IXa.

So, the correct answer is -heparin.