Answer
c.
Work Step by Step
Option a. is incorrect. Fibrins are sticky, insoluble filaments that form during the clotting process. These fibers trap blood components from escaping from a wound.
Option b. is incorrect. Thrombin is the converted form of prothrombin. Thrombin is an enzyme that catalyzes a part of the clotting process. The action of thrombin is to convert fibrinogen to fibrin.
Option d. is incorrect. Lymphocytes are white blood cells that have immune system functions.
Option c. is correct. Platelets are formed from bone marrow cells that have divided into fragments surrounded by cell membranes. These cell fragments are part of the clotting mechanism.
