Blood fails to clot white flowing in the blood vessel because of the presence of A)Heparin B)Prothrombin C)Haemoglobin D)Hirudin
Option A) Heparin also known as un-fractionated heparin, a highly sulfated glycosaminoglycan, is widely used as an injectable anticoagulant, and has the highest negative charge density of any known biological molecule.
