<P> Depolarization is sometimes referred to as "hypopolarization". </P> <Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (February 2015) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (February 2015) (Learn how and when to remove this template message) </Td> </Tr> <P> The process of depolarization is entirely dependent upon the intrinsic electrical nature of most cells . When a cell is at rest, the cell maintains what is known as a resting potential . The resting potential generated by nearly all cells results in the interior of the cell having a negative charge compared to the exterior of the cell . To maintain this electrical imbalance, microscopic positively and negatively charged particles called ions are transported across the cell's plasma membrane . The transport of the ions across the plasma membrane is accomplished through several different types of transmembrane proteins embedded in the cell's plasma membrane that function as pathways for ions both into and out of the cell, such as ion channels, sodium potassium pumps, and voltage gated ion channels . </P>

Explain the movement of sodium ions during depolarization