Which tactile receptor perceive pain and temperature?

Question

BlackTom AI · Accepted Answer

Free nerve endings are the receptors that perceive pain and temperature because they contain nociceptors and thermoreceptors and are unencapsulated, allowing direct detection of damaging or thermal stimuli.

1) Relevant knowledge points and concepts
- Sensory receptors in skin: encapsulated mechanoreceptors (Ruffini corpuscles, Merkel cells, Pacinian corpuscles, Meissner corpuscles, root hair plexuses) versus unencapsulated receptors (free nerve endings).
- Free nerve endings include nociceptors (pain) and thermoreceptors (temperature); they use thinly myelinated A-delta fibers (fast, sharp pain) and unmyelinated C fibers (slow, burning pain).
- Ruffini corpuscles detect skin stretch and sustained pressure (slow-adapting). Merkel cells detect light touch, texture, and pressure (slow-adapting, high spatial resolution). Root hair plexuses detect hair deflection (rapidly adapting).

2) Step-by-step reasoning
- Identify modality asked: pain and temperature (nociception and thermoreception).
- Match modality to receptor type: nociceptors and thermoreceptors are located in free nerve endings (unencapsulated terminals in epidermis and dermis).
- Exclude mechanoreceptors specialized for touch/pressure/hair movement.

3) (No numerical calculations required.)

4) Why the correct answer is correct
- Free nerve endings are specialized to transduce noxious mechanical, thermal, and chemical stimuli via receptor proteins (e.g., TRP channels) and transmit signals through A-delta and C fibers to the spinal cord, producing sensations of pain or changes in temperature. Their unencapsulated structure allows them to directly sample the local tissue environment for damaging or thermal changes.

5) Why the other options are incorrect
- Ruffini corpuscles: detect skin stretch and sustained pressure, not primary pain/temperature receptors.
- Merkel cells: sense light touch, pressure, and texture (high spatial acuity), not pain/temperature.
- Root hair plexuses: detect hair movement (dynamic tactile input), not pain/thermoreception.

6) Conclusion
The correct receptor for perceiving pain and temperature is Free nerve endings, which matches the provided answer.

Which tactile receptor perceive pain and temperature?Single choice

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