Action and graded potentials both use local current flow, but action potentials can travel long distances while graded potentials decay. How is this possible? A) Graded potentials only use Na⁺ and K⁺, while action potentials use other ions. B) Action potentials are regenerated as they travel along the axon. C) Refractory periods allow the channels to rest between action potentials so that they can travel a longer distance. D) Myelin prevents all charges from leaking out of the axon.

Question

Quizplus · Accepted Answer

Action potentials are regenerated as they travel along the axon due to the presence of voltage-gated ion channels. These channels open and close in response to changes in membrane potential and allow the action potential to propagate along the axon without losing strength. In contrast, graded potentials do not involve voltage-gated channels and decay as they travel away from their source.

Action and Graded Potentials Both Use Local Current Flow, but Action