What is the role of antithrombin III in the regulation of coagulation?

A To activate factor X
B To inhibit thrombin and other coagulation factors ✓
C To promote fibrinolysis
D To enhance platelet aggregation

Explanation

Antithrombin III is a protein that inhibits the activity of thrombin and other coagulation factors, thereby regulating the coagulation cascade.

Source

Robbins and Cotran Pathologic Basis of Disease
Hematology Hematology: Coagulation Disorders Hematology: Coagulation Disorders Medium MEDICAL Confidence: high