Respuesta :
The correct option is D
The fastest possible conduction velocity of action potentials is observed in thick myelinated neurons.
The fastest signals in our bodies are sent from the myelinated axons found in neurons which are responsible for the transmission of the sense of touch or proprioception.
Myelin effectively increases the speed of electrical impulses as it insulates the axon and makes the voltage-gated sodium channel clusters form at discrete nodes along its length in neurons and thus velocity conduction of action potential takes place.
Unmyelinated fibers possess no sodium channels whereas myelinated fibers have more sodium-potassium pumps in their respective membranes. Active transport of sodium and potassium is very much faster in myelinated fibers so that electrical signals conduction occurs faster through insulated regions of the axon which is myelinated.
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