Which of the following proteins is responsible for inhibiting the activity of factor Xa in the coagulation cascade?

A Antithrombin III
B Protein C
C Protein S
D Tissue factor pathway inhibitor
Antithrombin III is a protein that inhibits the activity of several coagulation factors, including factor Xa, by binding to them and preventing them from interacting with their substrates.
Guyton and Hall Textbook of Medical Physiology
Hematology Hematology: Coagulation Disorders Hematology: Coagulation Disorders Medium MEDICAL Confidence: high