<Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (September 2009) (Learn how and when to remove this template message) </Td> </Tr> <P> Fly spray is a chemical insecticide that comes in an aerosol can that is sprayed into the air to kill flies . Fly sprays will kill various insects such as house flies and wasps . </P> <P> Fly spray contains chemicals (including many organophosphate compounds) that bind to and permanently block the action of an enzyme called acetylcholinesterase . Acetyl choline (ACh) is the nerve transmitter substance released by motor neurones (at a site called the neuromuscular junction) to stimulate muscle contraction . The muscles relax (stop contracting) when the ACh is removed from the neuromuscular junction (NMJ) by the action of acetylcholinesterase . By inhibiting the cholinesterase the insect can no longer break down ACh in the NMJ and so its muscles lock up in a state of tetany (continuous contraction) making flying and respiration impossible, and the insect then dies of asphyxiation . </P> <P> Fly spray is dangerous to pets as well as fish and should be used with caution . </P>

Raid fly and wasp killer how does it work
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