Once the "threshold" for an action potential is reached what is the sequence of events that occur?
1)Potassium channels are activated and potassium ions move out of the neuron.
2)Sodium channels are activated and sodium ions move into the neuron.
3)The interior of the neuron becomes more negatively charged than the exterior.
4)The interior of the neuron becomes more positively charged than the exterior.
A)1,3,4,2
B)2,4,1,3
C)4,1,2,3
D)3,2,1,4

Question

Quizplus · Accepted Answer

Once the threshold for an action potential is reached, sodium channels are activated and sodium ions move into the neuron, causing the interior of the neuron to become more positively charged than the exterior. This depolarization triggers the activation of potassium channels, causing potassium ions to move out of the neuron and the interior of the neuron to become more negatively charged than the exterior. Therefore, the correct sequence of events is 2, 4, 1, and 3. Choice B matches this sequence.

Once the "Threshold" for an Action Potential Is Reached What