Which of the following proteins is responsible for inhibiting the coagulation cascade by binding to and inactivating factor Xa?

A Antithrombin III ✓
B Protein C
C Protein S
D Tissue factor pathway inhibitor

Explanation

Antithrombin III is a protein that inhibits the coagulation cascade by binding to and inactivating factor Xa.

Mnemonic

ATIII = Anti-Thrombin III, the 'anti' clotting factor

Source

Williams Hematology
Hematology Hematology: Coagulation Disorders Hematology: Coagulation Disorders Hard MEDICAL Confidence: high