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)Na⁺ channels are activated and then inactivated.
C)K⁺ channels open at the same time as the Na⁺ channels.
D)K⁺ channels are opened when Na⁺ binds to the channel.
E)K⁺ influx causes Na⁺ channels to inactivate.

Question

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)Na⁺ channels are activated and then inactivated.
C)K⁺ channels open at the same time as the Na⁺ channels.
D)K⁺ channels are opened when Na⁺ binds to the channel.
E)K⁺ influx causes Na⁺ channels to inactivate.

Quizplus · Accepted Answer

When an axon is stimulated to threshold, the voltage-gated Na⁺ channels are activated, leading to an influx of Na⁺ ions into the cell. These channels then become inactivated, preventing further influx of Na⁺ ions. Meanwhile, the voltage-gated K⁺ channels are also activated, leading to an efflux of K⁺ ions out of the cell. However, the opening of K⁺ channels happens slightly after the opening of Na⁺ channels.

Which Describes the Response of the Voltage-Gated Channels When an Axon