Why are action potentials usually generated at the axon hillock in vertebrate neurons? A) There is a high concentration of Na⁺ channels. B) There is a high concentration of K⁺ channels. C) This is the point at which most synaptic contacts are made. D) It is located at the beginning of the axon.

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Quizplus · Accepted Answer

Action potentials are generated at the axon hillock because there is a high concentration of sodium channels. Opening of sodium channels is required to generate an axon potential and with a large concentration of these channels in one place the action potential threshold is decreased.

Why Are Action Potentials Usually Generated at the Axon Hillock