What is the primary mechanism by which heparin exerts its anticoagulant effect in the blood?

A Inhibition of thrombin formation ✓
B Activation of protein C
C Enhancement of fibrinolysis
D Inhibition of platelet aggregation

Explanation

Heparin primarily exerts its anticoagulant effect by inhibiting the formation of thrombin, a key enzyme in the coagulation cascade.

Source

Guyton and Hall Textbook of Medical Physiology
Hematology Hematology: Blood Components Hematology: Blood Components Medium MEDICAL Confidence: high