During the repolarization phase of an action potential, what ions are being tran

Question

During the repolarization phase of an action potential, what ions are being transported through the cell membrane?

A) Potassium ions from inside of the cell, to the outside of the cells, through voltage sensitive potassium channels

B) Sodium ions from outside of the cell to the inside of the cells, through sodium channels

C) Sodium ions from inside of the cell to the outside of the cells, through sodium channels

D) Potassium ions from outside of the cell, to the inside of the cells, through voltage sensitive potassium channels

Explanation / Answer

During repolarization phase of an active potential, the ions which are being transported through the cell membrane are,

C) Sodium ions from inside of the cell to the outside of the cells, through sodium channels

D) Potassium ions from outside of the cell, to the inside of the cells, through voltage sensitive potassium channels.

To maintain a proper electrical charge across the cell membrane, the inside of the cell must have a negative charge and the outside must have a postitive charge. This is done by exporting three sodium ions out of the cell from inside and two potassium ions inside the cell from outside. this is called the sodium-potassium pump.

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