Arjun is studying in tenth standard. He was down with fever and went to meet the doctor. As he went to the clinic he saw a patient undergoing treatment for severe leech bite. Being curious, Arjun asked the doct,or why leech bite was not felt as soon as it attaches to the skin? What would have been the reply given by the doctor?

Explanation

The doctor would have explained to Arjun as follows :
Leeches inject an anaesthetic substance that prevents the host from feeling their bite. They also prevent blood clotting by secreting a protein called hirudin. Thus t-he person who is bit by the leech will feel the pain only ofter a long time.