BIO NMDCAT Receptors

nmdcat.online July 7, 2026

In the classification of sensory nerve fibers, the fastest conduction velocity is observed in

A. Unmyelinated C fibers

B. Small myelinated A-delta fibers

C. Large myelinated A-alpha proprioceptive fibers

✓

D. Postganglionic autonomic fibers

📝 Explanation

Conduction velocity increases with axon diameter and myelination. A-alpha fibers (carrying proprioceptive information from muscle spindles) are the largest and most heavily myelinated, allowing the fastest signal transmission.

📖 Additional Information

Unmyelinated C fibers
Small myelinated A-delta fibers
Large myelinated A-alpha proprioceptive fibers
Postganglionic autonomic fibers

Conduction velocity increases with axon diameter and myelination. A-alpha fibers (carrying proprioceptive information from muscle spindles) are the largest and most heavily myelinated, allowing the fastest signal transmission.

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