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

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

Explanation

Antithrombin III is a naturally occurring anticoagulant that inhibits the activity of thrombin and other coagulation factors, thereby preventing excessive clot formation.

Source

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