Discussion
An insect bite may result in inflammation of that spot. It is triggered by alarm chemicals such as
Answer: B
Correct answer: Histamine and kinins
The swelling and redness round a bite are produced by locally released mediators. Histamine comes from mast cell granules and dilates the small vessels while making them leaky; kinins, chiefly bradykinin, do the same and also stimulate the pain fibres, which is why the spot itches and hurts. Interferons act against viruses, opsonins tag microbes for phagocytosis, and histones are nuclear proteins.
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