What is the primary role of antithrombin III in the coagulation cascade?

A To activate factor X
B To inhibit thrombin and other coagulation factors ✓
C To promote fibrinolysis
D To synthesize von Willebrand factor

Explanation

Antithrombin III is a protease inhibitor that inactivates several enzymes of the coagulation system, including thrombin, factor Xa, and factor IXa.

Source

Guyton and Hall Textbook of Medical Physiology
Hematology Hematology: Coagulation Disorders Hematology: Coagulation Disorders Medium MEDICAL Confidence: high