Which of the following is present in the saliva of leeches?

Heparin

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Haemoglobin

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Hirudin

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Histamine

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Solution

The correct option is A Hirudin
Leeches have biologically active compounds in their saliva that mainly have an anti-thrombin function. One of those major compounds is hirudin. Thrombin is the chemical involved in the clotting of blood. Hirudin inhibits the action of thrombin and is responsible for the excessive bleeding that occurs when a leech bites an individual.
So, the correct answer is 'Hirudin'.

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