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Why is neuronal firing rate proportional to axonal diameter?

Biology Asked by Bryan Chang on January 10, 2021

I know that a larger axonal diameter results in faster speed of action potentials due to reduced resistance. However this doesn’t explain why the firing rate of neurons is proportional to neuronal diameter. Is it because higher spike rates require larger capacitance (since each spike charges the neuron) meaning a larger surface area and diameter of neuron is needed?

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