Sequence of Events Formation of a Blood Clot
Blood clotting involves a complex series of events. Test your knowledge of these events by placing the following
reactions in the proper order. Place a number 1 in the blank by the first reaction, a 2 in the blank by the second
reaction, and so on.
A. Sticky fibrin threads form a web at the site of the injury.
B. Both the intrinsic and extrinsic pathways result in the production of the enzyme prothrombin activator.
C. Thrombin transforms the soluble plasma protein fibrinogen into insoluble fibrin.
D. Red blood cells and platelets become ensnared in the fibrin web to create a clot of fibrin, blood cells, and
platelets.
E. Prothrombin is converted to the enzyme thrombin.
F. Prothrombin activator acts on the globulin prothrombin (factor II).
