The conversion of fibrinogen to fibrin

A. False  It is effected by thrombin; prothrombin is the inactive precursor of thrombin.

B. True  Thrombin breaks off the solubilizing end groups.

C. True  Polymerized fibrin monomers form the strands of the clot meshwork.

D. True  This is a rapidly acting anticoagulant.

E. False  Plasmin does not convert fibrin back to fibrinogen, it degrades both fibrin and fibrinogen to products which can inhibit thrombin.