Physiology & Biochemistry · single question
Which type of nerve fiber mediates dull, aching pain?
Show answer and explanation
Correct answer: A. C fiber
- A. Correct. Unmyelinated C fibers conduct slowly and carry dull, aching, poorly localized (second) pain.
- B. A-delta fibers carry sharp, fast, well-localized (first) pain — e.g., a cold test response.
- C. A-beta fibers carry touch/pressure, not pain.
- D. B fibers are preganglionic autonomic fibers, not nociceptive afferents.
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