Membrane potential cannot exceed +30 mV because at this level, voltage-gated sodium channels close, and ____.
A)potassium moves across the cell membrane via passive transport proteins
B)sodium moves across the cell membrane via passive transport proteins
C)potassium gated channels open
D)potassium flows into the cytoplasm
E)the action potential is not propagated

Question

Quizplus · Accepted Answer

At a membrane potential of +30mV, the depolarization triggers the opening of voltage-gated potassium channels, leading to an efflux of potassium ions, which causes the membrane potential to become more negative. This repolarization event causes the sodium channels to close, stopping the influx of sodium ions. Therefore, the correct answer is C.

Membrane Potential Cannot Exceed +30 MV Because at This Level