Multiple choice

Anticoagulant of fresh water leech is ______.

  1. hirudin

  2. heparin

  3. sodium citrate

  4. chelating agent
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A Correct answer
Explanation

Hirudin is the specific anticoagulant produced by the salivary glands of medicinal leeches (Hirudo medicinalis). It prevents blood clotting during feeding by inhibiting thrombin. Heparin is produced by mast cells in mammals, sodium citrate is an inorganic anticoagulant used in blood storage, and chelating agents are a broader category of compounds that bind metal ions.

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