Which of these does not prevent the spontaneous formation of a clot?
A) The presence of tissue thromboplastin
B) The smooth prostacyclin-coated endothelium of blood vessels
C) The dilution of thrombin when blood flows at a normal rate
D) The presence of antithrombin in plasma
E) The presence of heparin in plasma

Question

Quizplus · Accepted Answer

The presence of tissue thromboplastin actually promotes the spontaneous formation of a clot. Tissue thromboplastin is released by damaged tissue and initiates the extrinsic pathway of coagulation, leading to the formation of a fibrin clot. The other options listed all prevent or inhibit clot formation.

Which of These Does Not Prevent the Spontaneous Formation of a Clot