There are pain receptors scattered all over the human body; some can be found near the skin, in muscles, and on bones. When these nerves receive a big enough input, they open up and send a wave of positively-charged ions into the nerve, which sends the pain sensation to the central nervous system and brain.

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The pain receptors might be activated through a number of different mechanisms, from a flame hitting someone’s finger, to a dangerous chemical being splashed on a hand or eye, to scalding coffee being spilled. All of these might result in pain from mechanical, chemical, or temperature changes that act on the nerves.

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The brain, combined with the spinal cord, analyzes the messages received from the pain receptors and determines whether or not the body is in danger. If danger is perceived, then pain is the result, but if the body senses are not sufficient to cause pain, the brain does not transmit the message to moveprotect} the body part.