Action Potentials Are Propagated in a One-Way Direction Down a Neuronal

question 48

Multiple Choice

Action potentials are propagated in a one-way direction down a neuronal plasma membrane because

• A) the action potential is of insufficient intensity to stimulate the voltage-gated ion channels behind it
• B) the adjacent channels upstream from the action potential are ligand-gated
• C) the adjacent channels upstream from the action potential are in a refractory period
• D) voltage-gated ion channels are suppressed
• E) the adjacent channels upstream from the action potential are at their threshold potential

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