Unreliable facts
Instructions: Select the 3/12 correct sentences
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Electrotonic flow of current along a neuron has the advantage of being regenerative but is slow.
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The propagation of an Action Potential allows for a rapid transmission of information from one point along the neuron along the neuron’s length.
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In Action Potential propagation, an individual AP physically transports its charge along the length of the neuron to arrive at the neuron’s terminals with amplitude intact.
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Unidirectional transmission of Action Potentials is ensured by the refractoriness of each part of the neuron that has just produced an AP.
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As a fail-safe mechanism, Action Potentials only occur when the resting membrane potential reaches the threshold for the chemically-gated ion channels to be activated by neurotransmitter inputs.
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An AP is regenerative in the sense that the current flowing into a neuron during an AP can spread electrotonically along to trigger another AP just-adjacent to the starting depolarization.
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AP regeneration reconstitutes the information of the initial AP triggering event to cause a flow of that information and also speeds it up.
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The conduction velocity of neural information flow is enhanced by increasing axon diameter which allows the neuron to produce a larger influx of Na+ ions and thereby produce a larger AP.
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The conduction velocity of neural information flow is enhanced by covering the entire axon with a myelin sheath with no interruptions in the sheath along the neuron’s length.
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The neurons with the fastest conduction velocity are those with large axon diameters as well as uninterrupted longer myelin sheaths.
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The neurons with the slowest conduction velocity have the smallest axon diameters and are also devoid of myelin sheaths.
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Of the factors that increase conduction velocity of neural information flow, the major factor is AP regeneration, followed by the presence of a myelin sheath, and finally the axon diameter size.