The following are true about blood coagulation:
a. heparin inhibits blood coagulation through its interference with vitamin K metabolism in the liver
b. addition of vitamin K to freshly drawn blood delays clotting
c. thrombin converts fibrinogen to fibrin
d. platelets are essential for blood clot
a. heparin inhibits blood coagulation through its interference with vitamin K metabolism in the liver
b. addition of vitamin K to freshly drawn blood delays clotting
c. thrombin converts fibrinogen to fibrin
d. platelets are essential for blood clot