contestada

Action potentials move along axons
A. more slowly in axons of large than in small diameter
B. by activating the sodium-potassium "pump" at each point along the axonal membrane
C. more rapidly in myelinated than in unmyelinated axons
D. by reversing the concentration gradients for sodium and potassium ions

Relax

Respuesta :

C, more rapidly in myelinated than in non-myelinated axons.

Continuous propagation is the method used to transfer action potentials through unmyelinated axons, in which the traveling action potential impacts one segment of the axon at a time. The cycle repeats, propagating the action potential up the axon in just one direction, at a rate of around 1 meter/sec, until a local current depolarizes the following segment to threshold.

Saltatory propagation, which is quicker and requires less energy, transports an action potential through a myelinated axon. The action potential's local current "jumps" from one Ranvier node to the next in saltatory propagation.

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