<prompt> Role of sodium fluoride as a preservative for blood in viscera packing are all exceptIt prevents glycolysisActs as anti-coagulantInhibits bacterial growthInhibits enolase enzyme  <response>: Potassium oxalate - anti coagulant and 10 mg ml Sodium or Potassium fluoride are used for blood preservation. Acts as preservative by following mechanism: - Prevents glycolysis - Inhibits bacterial growth - Inhibits enolase enzyme 