HEPARIN IS A NATURALLY OCCURING ANTICOGULANT PRODUCED BY BASOPHILIC LEUCOCYTE(wbc).
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Jeya Maria Jose V. answered this
HI,
Heparin is an anti-coagulant. it is used by some insects to suck blood .When those insects inject heparin ,the blood doesn't clot and it is easy for them to suck blood without obstruction.