Which Anticoagulant is Secreted by Mast Cells (Basophils)

Question

Which anticoagulant is secreted by mast cells (basophils)?
A) Plasmin
B) EPO
C) Vitamin K
D) Heparin

Accepted Answer

Mast cells (a type of basophil) secrete heparin, an anticoagulant that inhibits clotting by enhancing the activity of antithrombin III. Plasmin is not secreted by mast cells, it is an enzyme that degrades fibrin clots. EPO (erythropoietin) is a hormone secreted by the kidneys that stimulates the production of red blood cells. Vitamin K is a cofactor required for the synthesis of several clotting factors.