system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What does bug spray do to an insect that makes them writhe around as soon as they’re sprayed?
gpt
Many insecticides contain pyrethrins which bind to the sodium channels responsible for nerve transmission. Application of insecticides containing pyrethrins results in initial hyperactivity of the nervous system (inducing the writhing you describe), then blockage of all nerve impulses resulting in death.