Which of the following represents the sequence of ion movements that causes an action potential?
A)Sodium ions move into the axon and then potassium ions move out of the axon.
B)Sodium ions move out of the axon and then potassium ions move into the dendrite.
C)Potassium ions move out of the dendrite and then sodium ions move into the axon.
D)Sodium ions move out of the axon and then potassium ions move into the axon.

Question

Quizplus · Accepted Answer

During an action potential, the first step is the influx of sodium ions into the axon, which depolarizes the membrane. This is followed by the efflux of potassium ions out of the axon, which repolarizes the membrane. Therefore, option A represents the correct sequence of ion movements during an action potential.

Which of the Following Represents the Sequence of Ion Movements