How Does Anesthesia Work and Why

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Local anesthetics block the nerves that connect a particular body part or region to the brain, preventing the nerves from carrying pain signals to your brain. When under anesthesia, you can’t move or — hopefully — feel pain. And while it might just seem like you are asleep for that time, you actually aren’t. Steven Zheng explains what we know about the science behind anesthesia.


TED-Ed