Which nerve fiber conducts action potentials the most rapidly?

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Multiple Choice

Which nerve fiber conducts action potentials the most rapidly?

Explanation:
Conduction velocity depends mainly on myelination and axon diameter. Heavily myelinated, large-diameter fibers enable rapid saltatory conduction, so they transmit signals fastest. Among the options, the A fiber has the largest diameter and is well myelinated, giving the highest conduction speed. A-delta fibers are smaller and only moderately fast, B fibers are myelinated but smaller than A fibers, and C fibers are unmyelinated and slowest. Thus, the fastest conduction occurs in the A fiber.

Conduction velocity depends mainly on myelination and axon diameter. Heavily myelinated, large-diameter fibers enable rapid saltatory conduction, so they transmit signals fastest. Among the options, the A fiber has the largest diameter and is well myelinated, giving the highest conduction speed. A-delta fibers are smaller and only moderately fast, B fibers are myelinated but smaller than A fibers, and C fibers are unmyelinated and slowest. Thus, the fastest conduction occurs in the A fiber.

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