Chapter 22. Depolarization of the Plasma Membrane Due to Opening of Gated Na⁺ Channels

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Animation Activity 22-09: Depolarization of the Plasma Membrane Due to Opening of Gated Na⁺ Channels

In resting neurons:

nongated K⁺ channels are open part of the time.

gated K⁺ channels are closed.

gated Na⁺ channels are closed.

there is little movement of Na⁺ ions into the cell.

All of the above

Correct.

Incorrect.

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An action potential results in all of the following EXCEPT:

movement of Na⁺ ions into the cell.

depolarization of the membrane.

an inside negative membrane potential.

reversal of the membrane potential.

opening of gated Na⁺ channels.

Correct.

Incorrect.

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If a neuron possesses a defective Na⁺ channel that does not open, what would be expected?

The membrane potential would remain inside negative because Na⁺ cannot move into the cell.

The membrane potential would remain inside positive because Na⁺ cannot move out of the cell.

The cell would remain depolarized.

The Na⁺ concentration inside the cell would be continually higher than that outside.

All of the above

Correct.

Incorrect.

Try Again.

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