Which of the Following Sequences Accurately Reflects the Phases of an Action

Multiple Choice

Which of the following sequences accurately reflects the phases of an action potential?

A) Membrane potential at -55 mV; stimulus; opening of potassium channels; closure of potassium and opening of sodium channels; action potential; refractory period.
B) Membrane potential at -55 mV; stimulus; opening of sodium channels; action potential; closure of sodium and opening of potassium channels; refractory period.
C) Membrane potential at -70 mV; stimulus; opening of sodium channels; action potential; closure of sodium and opening of potassium channels; refractory period.
D) Membrane potential at -70 mV; stimulus; opening of potassium channels; action potential; closure of potassium and opening of sodium channels; refractory period.