As we grow, we install pain detectors in most areas of our body. These detectors are specialized nerve cells called nociceptors that stretch from your spinal cord to your skin, your muscles, your joints, your teeth and some of your internal organs. Just like all nerve cells, they conduct electrical signals, sending information from wherever they’re located back to your brain. But, unlike other nerve cells, nociceptors only fire if something happens that could cause or is causing damage.

From the TED-Ed Lesson How do pain relievers work? - George Zaidan

Animation by Augenblick Studios

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