Which describes the response of the voltage-gated channels when an axon is stimulated to threshold?
A. K+ channels open before the Na+ channels.
B. K+ influx causes Na+ channels to inactivate.
C. K+ channels open at the same time as the Na+ channels.
D. K+ channels are opened when Na+ binds to the channel.
E. Na+ channels are activated and then inactivated.
Answer: E
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