What does myelin do for a neuron? It increases the speed of action potentials. It decreases the frequency of action potentials. It makes a neuron smarter. It increases the speed of action potentials and it decreases their frequency.
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How does myelination affect the propagation of an action potential? a. It speeds propagation by increasing the density of voltage-gated channels all along the axon. b. It slows propagation by increasing electrochemical gradients favoring Na $^{+}$ entry. c. It speeds propagation by preventing cations from leaking out across the membrane as they spread down the axon. d. It slows propagation by restricting voltage-gated $\mathrm{Na}^{+}$ channels to gaps in the myelin (nodes of Ranvier)
The function of the cell shown in the diagram is to ________. a. myelinate PNS neurons b. myelinate CNS neurons c. increase action potential propagation speed d. decrease action potential propagation speed e. Both a and $c$ are correct.
Myelination increases the velocity of action potential propagation along an axon. What is myelination? Myelination causes clustering of voltage-gated $\mathrm{Na}^{+}$ channels and $\mathrm{Na}^{+} / \mathrm{K}^{+}$ pumps at nodes of Ranvier along the axon. Predict the consequences to action potential propagation of increasing the spacing between nodes of Ranvier by a factor of 10
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