alleryWhich anticoagulant protein, secreted by the salivary glands of a leech, prevents the host's blood from clotting?
AThrombin
BHeparin
CHistamine
DHirudin
Answer & Solution
Correct answer: D. Hirudin
1. The salivary glands of the leech surround the pharynx.
2. Their secretion contains a protein that stops blood from clotting.
3. This protein is hirudin.
4. Thrombin actually promotes clotting, the opposite effect, so it is the trap.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 13 Structural Organisation of Animals "Digestive System", p.196_
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