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For a typical neuron, what limits the maximal frequency attainable of action potentials moving down an axon?

Question

For a typical neuron, what limits the maximal frequency attainable of action potentials moving down an axon?

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Solution

The maximal frequency of action potentials moving down an axon in a typical neuron is limited by several factors:

  1. Refractory Period: After an action potential, a neuron enters a refractory period during which it cannot fire another action potential. This period is divided into two parts: the absolute refractory period, during which it is impossible for the neuron to initiate another action potential, and the relative refractory period, during which it is harder, but not impossible, for the neuron to initiate another action potential. The refractory period thus sets an upper limit to the frequency of action potentials.

  2. Axon Diameter: The diameter of the axon also affects the speed of action potentials. Larger diameter axons conduct action potentials more rapidly than smaller ones.

  3. Myelination: Myelinated axons conduct action potentials more rapidly than unmyelinated ones. Myelination increases the speed of propagation of action potentials (also known as nerve

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