Physiology Physiology of Pain c944359d Fast pain has a conduction velocity of _____ m/sec. A 1 B 5 C 15 D 50 High-Yield Explanation Fast pain has a nerve fiber (A delta) conduction velocity of 12 to 30 m/sec. Slow pain has a nerve fiber (C) conduction velocity of 0.5 to 2 m/sec.