Use the following to answer questions :

-Which of the following factors best explains the cause of the onset of a period where the neuron shown will not fire?
A) The channels at the region labeled 3 are closed.
B) The sodium ions at the region labeled 3 are depleted.
C) The channels at the region labeled 4 are open.
D) The sodium ions at the region labeled 4 are replenished.

Question

Use the following to answer questions :
 
-Which of the following factors best explains the cause of the onset of a period where the neuron shown will not fire?
A) The channels at the region labeled 3 are closed. 
B) The sodium ions at the region labeled 3 are depleted. 
C) The channels at the region labeled 4 are open. 
D) The sodium ions at the region labeled 4 are replenished.

Quizplus · Accepted Answer

The channels at region labeled 3, which are responsible for sodium influx into the cell leading to depolarization and firing of the neuron, are closed. Therefore, the neuron cannot fire.

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