How do myelinated nerves conduct nerve faster than unmyelinsted nerves?

Answer 1

With the myelinated nerves, the electrical signal jumps from one space between the myelin to another making the signal to travel faster while the unmyelinated nerves have electrical signals that has to travel all the way through without jumping.

Answer 2

Its because myelinated axons are covered with sheath which give's a sort of boost to the impulse, and myelinated axons has nodes contributing to it being faster as ion concentration is not charging all the way

Answer 3

In myelinated fibres the neurons axon is covered in a myelinated sheath made out of schwann cells. These are insulatory so do not let sodium ions escape through the membrane of an axon. This is useful because sodium ions cause electrical impulses (action potentials), so the more sodium ions in the neurone the faster the electrical impulses will be. Impulse speed also is determined by the thickness and length of an axon.

Answer 4

Because a faster saltatory conduction is what's actually happening, not simply the action potential.

Saltatory conduction is the mode of neural impulse transmission which happens in a myelinated neuron, and it is comprised of two separate transmission modes, the action potential, and a faster electrotonic conduction.

Neurons which are myelinated have a series of smaller glial cells wrapped one after another along the axon, with small gaps between them.

The gaps are called the nodes of Ranvier, and the glial cells are Schwann cells in the Peripheral Nervous System, and Oligodendrocytes in the Central Nervous System.

The glial cells prevent any ion exchange from occurring where they are wrapped, so the action potential can't happen there, it can only happen at the gaps where they aren't present.

But under the glial cells, something very fastdoes happen!

When sodium ions are first presented to the axon at the axon hillock from the first opening of voltage-gated sodium-pores from the summation of voltages at the axon hillock from input signals coming from multiple dendrites, those sodium-ions come (inside the axon) to the beginning edge of the first glial cell wrapped around the axon, and electrotonically repel one another, with the result that their charge is almost immediately manifested within the axon at the other edge of that glial cell, where there now are voltage-gated sodium-ion pores, which open, and allow in more sodium ions in an action potential.

Since there is a series of those glial cells, with small spaces between them, wrapped one after another, this one-two process of electrotonic conduction followed by an action potential repeats itself over and over again until the impulse reaches the end of the axon.

And because the gap between the glial cells is much smaller than the wrapped length of the glial cells, and the speed of the electrotonic conduction under the glial cells is much faster than the speed of an action potential, the result of this saltatory conduction is a neural impulse which travels much faster than the action potential; and even though the electrotonic conduction becomes weaker by the time it gets to the further edge of each glial cell, it gets re-strengthened by the input of sodium ions from the action potential that occurs at the gaps.

So, in a myelinated neuron, by saltatory conduction you get a much faster movement of the impulse along the axon, but it retains the condition of being at the same strength at its end as at its beginning.
Gray Matter

Answer 5

Yes. The myelinated axons have gaps between the Shwann cells containing the myelin. The gaps are called the gaps of Ranvier, and they help speed up the transmission of the impulse, or action potential.

Answer 6

In myelinated nerves, the nerve impulse "skips" quickly from one unmyelinated node (nodes of ranview) to another...eliminating the need to propagate down the entire length of the axon.

Answer 7

Insulation, or at least due to the insulating effects of the myelin sheathing [i. e. multiple layers] sequestering the axon from the environs.