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Which three types of harmful stimuli activate pain receptors?
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pain
Learn how the human body senses pain and reacts to it.
Pain receptors, also known as nociceptors, are specialized nerve endings that detect stimuli capable of causing tissue damage. These receptors are activated by three primary types of stimuli:12
- Mechanical: Stimuli such as cutting, pressure, or other physical forces that deform or damage tissue.12
- Thermal: Stimuli involving extreme temperatures, such as burning or intense cold, that can harm the body.12
- Chemical: Stimuli resulting from substances that irritate tissues or are released by the body during injury or inflammation, such as bradykinin, serotonin, and histamine.1
While some nerve endings respond primarily to one of these categories, others are capable of detecting all three.1