What happens in the body and the nervous system from the moment you see this bug?

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added