Membrane Potential Cannot Exceed +30 MV Because at This Level

Multiple Choice

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