Each voltage-gated Na+ channel has two voltage sensitive gates: an activation gate and an inactivation gate. Which of the following would occur during depolarization?
A. Activation gates are open; inactivation gates are closed.
B. Both activation and inactivation gates are closed.
C. Activation gates are closed; inactivation gates are open.
D. Both activation and inactivation gates are open.
E. None of the choices are correct.
Answer: D
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