During the rapid increase in membrane potential seen in the upsweep of the action potential, which of the following is TRUE?
A. Both the activation and inactivation gates of the voltage-gated sodium channels are open.
B. The voltage-gated potassium channel is open.
C. The potassium leak channels are closed.
D. The sodium leak channels are closed.
E. The sodium/potassium pump has reversed directions and is pumping sodium in and potassium out.
A. Both the activation and inactivation gates of the voltage-gated sodium channels are open.
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