Which is most directly responsible for the falling (repolarizing) phase of the action potential?
A. Voltage-gated Na+ channels are opened.
B. The Na+, K+ pump restores the ions to their original locations inside and outside of the cell.
C. The permeability to Na+ increases greatly.
D. ATPase destroys the energy supply that was maintaining the action potential at its peak.
E. The permeability to K+ increases greatly while that to Na+ decreases.
E
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