Heparin sodium is an anticoagulant.The basic mechanism of heparin's action is best described as:
A) it blocks the conversion of prothrombin to thrombin and fibrinogen to fibrin.
B) it acts as an enzyme by lysing the fibrin-thrombin matrix.
C) it extends the activated partial thromboplastin time (APTT) .
D) it dissolves and liquefies existing blood clots and thromboemboli.
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