Q. The primary mechanism by which heparin prevents coagulation of blood is: (Solved)
1. Direct inhibition of prothrombin to thrombin conversion
2. Facilitation of antithrombin III mediated inhibition of factor Xa and thrombin
3. Activation of antithrombin III to inhibit factors IX and XI
4. Inhibition of factors XIIa and XIIIa
- b. Facilitation of antithrombin III mediated inhibition of factor Xa and thrombin