What is the order of events when a neuron fires an action potential?

The order of events when a neuron fires an action potential is as follows:

1. Depolarization: The neuron's membrane potential is changed from its resting potential to a more positive voltage.
2. Threshold: The membrane potential reaches a critical level, known as the threshold potential, which triggers the action potential.
3. Action potential: An all-or-none electrical impulse is generated and propagates along the axon.
4. Repolarization: The membrane potential returns to its resting potential.

Did you know?

Did you know that when a neuron fires an action potential, there is a specific order of events that occurs? First, the neuron receives a stimulus, which causes the cell membrane to become depolarized, meaning that the inside of the cell becomes more positive. Then, if the depolarization reaches a certain threshold, voltage-gated sodium channels open, allowing sodium ions to rapidly enter the cell. This influx of positive charge causes an even greater depolarization, creating an action potential. After a brief period, the sodium channels close, and voltage-gated potassium channels open, allowing potassium ions to exit the cell. This causes repolarization, where the cell returns to its negative resting state. Finally, there is a brief period of hyperpolarization before the cell returns to its normal resting potential, ready to receive another stimulus.