What can help prevent clots from forming in undamaged blood vessels?

Question

Quizplus · Accepted Answer

Heparin is a natural anticoagulant released by basophils and mast cells, which prevents clot formation. A smooth endothelium of blood vessel walls also acts as a physical barrier, preventing platelets and clotting factors from coming in contact with the underlying tissue and forming a clot. Therefore, both heparin and a smooth endothelium are correct choices to help prevent clot formation in undamaged blood vessels.

What Can Help Prevent Clots from Forming in Undamaged Blood