Question -Leech secretes _______ as an anti-coagulant.
Options:
A .  Heparin
B .  Hirudin
C .  Serotonin
D .  Histamine
Answer: Option B : B Leech belongs to Class Hirunidinea under Phylum Annelida.To feed on their hosts, leeches use their anterior suckers to connect to hosts for feeding. Once attached, the leech uses a combination of mucus and suction to stay attached, and secretes an anticoagulant enzyme called hirudin, into the host's blood stream.Due to the hirudin secreted, bites may bleed more than a normal wound even after the leech is removed.
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