What is nociception?

• A. Process by which neurons detect potentially damaging stimuli
• B. The perception of pain in the brain
• C. A reflex arc causing muscle contraction
• D. A type of inflammatory response

Answer: (A)

Nociception is the sensory detection of potentially damaging stimuli by specialized nerve endings called nociceptors. These free nerve endings respond to mechanical, chemical, or thermal noxious signals and transduce them into electrical impulses that travel along peripheral nerves to the spinal cord and onward to the brain. This process is about detection and signaling of harmful stimuli, not the conscious experience of pain itself. Pain is the perception that arises after these signals are processed and interpreted in the brain. So the statement that nociception is the detection of potentially damaging stimuli best captures the concept. It’s distinct from a reflex arc, which is an immediate, almost automatic motor response, and from an inflammatory response, which is an immune process.