system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how do anesthetics knock you out within 10 seconds of being injected?
gpt
Nobody is actually answering the question: which is how do they **knock you out in 10 seconds** not just “how do they knock you out” which is much less clear.

The answer as to why does it work so fast is that anesthetics are extremely fat soluble, which means they enter the brain extremely quickly. Anything which can enter the brain extremely quickly will have a fast onset and thus works very quickly.