Which statement best describes the location and activation of nociceptors?

Which statement best describes the location and activation of nociceptors?

• A. Nociceptors are located at nerve endings of tissues; sensory receptors for pain; activated by mechanical/thermal/chemical stimuli; produce action potentials
• B. Nociceptors are located at the brain and do not transmit signals
• C. Nociceptors are located only in bones
• D. Nociceptors respond to electrical stimulation only

Answer: (B)

Nociceptors are peripheral sensory endings located in tissues such as skin, joints, and viscera. They detect potentially harmful mechanical, thermal, or chemical stimuli and convert that energy into electrical signals by opening ion channels, producing action potentials that travel along primary afferent neurons toward the spinal cord and brain. The brain does not contain nociceptors; it only receives and interprets these signals. They are not limited to bones and do not respond only to electrical stimulation—they respond to a range of noxious stimuli to drive the experience of pain.

Nociceptors are peripheral sensory endings located in tissues such as skin, joints, and viscera. They detect potentially harmful mechanical, thermal, or chemical stimuli and convert that energy into electrical signals by opening ion channels, producing action potentials that travel along primary afferent neurons toward the spinal cord and brain. The brain does not contain nociceptors; it only receives and interprets these signals. They are not limited to bones and do not respond only to electrical stimulation—they respond to a range of noxious stimuli to drive the experience of pain.