Normal blood clotting requires

A. False  The anticoagulant effects of heparin are overwhelmed.

B. False  Blood clots in spite of the fibrinolytic system.

C. True  Removal of calcium ions prevents clotting.

D. True  Vitamin K is needed by the liver for synthesis of prothrombin and other factors

E. False  The spontaneous bleeding from the gums etc. seen in scurvy is due to capillary abnormality, not a clotting defec