When an action potential occurs, what is the correct order of events from first to last?

When an action potential occurs, what is the correct order of events from first to last?

• A. 5 -> 2 -> 3 -> 1 -> 6
• B. 3 -> 5 -> 7 -> 1 -> 6
• C. 5 -> 2 -> 7 -> 4 -> 1
• D. 3 -> 5 -> 2 -> 4 -> 1

Answer: (C)

The sequence of events during an action potential is crucial to understanding how nerve impulses are transmitted. The correct order specified in option C emphasizes the steps that occur as the action potential propagates along a neuron. Initially, a stimulus causes the neuron's membrane to reach a threshold, leading to depolarization. This is represented by the first component in the sequence, which corresponds to the rapid influx of sodium ions into the cell, marked as 5. This depolarization quickly shifts the membrane potential toward a positive value. Next, as the membrane potential becomes more positive, it reaches a peak, which is the third step indicated by option C. This phase reflects the maximum depolarization, represented as 2. Following this peak, the next event involves repolarization, where potassium ions exit the neuron to restore the negativity inside the cell, marked by step 7. The sequence then progresses to the hyperpolarization phase, represented as step 4. During this phase, the membrane potential briefly becomes even more negative than the resting state due to excessive potassium ion outflow. Finally, the last step involves the return to the resting membrane potential, represented as step 1, completing the action potential cycle. This order of events demonstrates how the intricate flow

The sequence of events during an action potential is crucial to understanding how nerve impulses are transmitted. The correct order specified in option C emphasizes the steps that occur as the action potential propagates along a neuron.

Initially, a stimulus causes the neuron's membrane to reach a threshold, leading to depolarization. This is represented by the first component in the sequence, which corresponds to the rapid influx of sodium ions into the cell, marked as 5. This depolarization quickly shifts the membrane potential toward a positive value.

Next, as the membrane potential becomes more positive, it reaches a peak, which is the third step indicated by option C. This phase reflects the maximum depolarization, represented as 2. Following this peak, the next event involves repolarization, where potassium ions exit the neuron to restore the negativity inside the cell, marked by step 7.

The sequence then progresses to the hyperpolarization phase, represented as step 4. During this phase, the membrane potential briefly becomes even more negative than the resting state due to excessive potassium ion outflow. Finally, the last step involves the return to the resting membrane potential, represented as step 1, completing the action potential cycle.

This order of events demonstrates how the intricate flow