Why are pain receptors important?
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It’s an evolutionary response to danger. Pain receptors alert you to injury/ danger and tell you to react accordingly.
There is a condition (very rare) where you can be born without the part of your brain that processes pain. It can be very dangerous. For example if they stood on a nail. They would feal the pressure and discomfort but no pain, meaning you wouldn’t pull their foot off, they would never feel hungry and need to keep up on eating or risk organ damage, their appendix could burst and they wouldn’t know it (everyone else would have crippling stomach pain which is the first outward symptom) and they would die from not seeking treatment
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