What is the role of protein S in the coagulation pathway?

A It acts as a cofactor for protein C ✓
B It inhibits the activity of factor VIII
C It enhances the activity of factor X
D It inhibits the activity of factor II

Explanation

Protein S serves as a cofactor for activated protein C, which helps to regulate the coagulation cascade by inactivating factors Va and VIIIa.

Source

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