Physiology & Biochemistry · single question
Which fiber is activated during a cold test on a vital tooth?
Show answer and explanation
Correct answer: A. A-delta fiber
- A. Correct. The sharp, brief response to cold (hydrodynamic fluid movement) is carried by fast myelinated A-delta fibers.
- B. C fibers respond to heat and lingering/throbbing pain, not the sharp cold response.
- C. A-beta fibers transmit light touch, not thermal pulpal pain.
- D. B fibers are autonomic preganglionic fibers, unrelated to pulp testing.
Practice Physiology & Biochemistry questions Physiology & Biochemistry study notes