What mechanism causes the voltage-gated Na+ channels to close during an action potential?
A) The activation gate is voltage sensitive and closes close to the equilibrium potential for Na+.
B) The activation gate is sensitive to K+ and closes when its intracellular concentrations drop.
C) The inactivation gate has a time-dependent closure.
D) The inactivation gate is voltage sensitive and closes close to the equilibrium potential for Na+.
Answer: C
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