Question

a physiologist testing signal transduction rates in two different nerve fibers notices that one fiber conducts signals much faster than the other. which is the most likely difference between the two? multiple choice the faster nerve fiber is myelinated and the slower one is not the slower nerve fiber is myelinated and the faster one is not the faster nerve fiber has more dendrites.

Explanation:

Myelination of nerve fibers (by Schwann cells in PNS or oligodendrocytes in CNS) increases signal conduction speed via saltatory conduction (action potentials jump between nodes of Ranvier). Unmyelinated fibers conduct slower as action potentials propagate continuously along the axon. Dendrites are for receiving signals, not directly related to conduction speed, so the option about dendrites is incorrect. The option reversing myelination - speed relationship is also wrong as myelination speeds conduction.

Answer:

The faster nerve fiber is myelinated and the slower one is not