ANSWERS: 5
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Most painkillers that you take orally do not numb a specific area. Instead they affect the ability for your brain to receive signals that say ANY part of your body is feeling pain.
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It numbs your brain to receiving the pain messages rather than numbing a particular area. Anaesthetic that is localised numbs an area via a different mechanism that I am not sure on.
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It doesn't need to know where to work, becuase it doesn't "numb" at all. Pain killers block pain receptors, so it doesn't matter where the pain was. The brain is kept from knowing about it, basically.
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Taking a painkiller affects the whole body.
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not sure how but they probably make them that way
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