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The naturally occurring anticoagulant in the human blood is -

  • A.Hirudin
  • B.Heparin
  • C.Serotonin
  • D.Fibrinogen

Answer: B

Heparin is the natural anticoagulant of the blood. It is produced by mast cells and by the basophils, and it works by activating antithrombin, which then inactivates thrombin.

It is what keeps blood fluid inside the vessels. Hirudin is the anticoagulant of the leech, not of human blood.

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