Correct option is C
The correct matches are:
- a: Aα fibers → iii (70-120 m/s): Aα fibers are large, myelinated fibers that conduct nerve impulses at the fastest speeds.
- b: B fibers → iv (3-15 m/s): B fibers are smaller and less myelinated, resulting in slower conduction velocities.
- c: Aδ fibers → i (12-30 m/s): Aδ fibers conduct faster than B fibers but slower than Aα fibers.
- d: Aβ fibers → ii (30-70 m/s): Aβ fibers are myelinated fibers responsible for touch and pressure sensations, which conduct at moderate speeds.
Explanation:
- Aα fibers (a) are the fastest and largest nerve fibers, typically conducting at 70-120 m/s (match to iii).
- B fibers (b) are autonomic fibers, and they have slower conduction speeds, generally in the range of 3-15 m/s (match to iv).
- Aδ fibers (c) are medium-sized fibers associated with pain and temperature sensations, and they conduct at 12-30 m/s (match to i).
- Aβ fibers (d) are responsible for carrying touch and pressure information and conduct at a speed range of 30-70 m/s (match to ii).
Information Booster:
- Aα fibers: These fibers are large and heavily myelinated, responsible for conducting motor signals to skeletal muscles, with the fastest conduction speeds.
- B fibers: These fibers are smaller and associated with the autonomic nervous system, carrying autonomic signals at slower speeds.
- Aδ fibers: These fibers are smaller than Aα fibers but larger than C fibers and transmit sensory information about pain and temperature.
- Aβ fibers: These fibers are responsible for carrying tactile information and operate at moderate speeds, faster than B fibers but slower than Aα fibers.
- The conduction velocity in nerve fibers is primarily influenced by the fiber diameter and the degree of myelination. Larger, more myelinated fibers conduct faster.
- This classification helps in understanding how different types of nerve fibers function based on the needs of the sensory or motor tasks.
