When a membrane is at rest, what attracts sodium ions to the inside of the cell?
A) An electrical gradient
B) A concentration gradient
C) Both an electrical gradient and a concentration gradient
D) Neither an electrical gradient nor a concentration gradient

Question

Quizplus · Accepted Answer

Sodium ions are attracted to the inside of the cell by both an electrical gradient and a concentration gradient. The electrical gradient is due to the inside of the cell being more negatively charged relative to the outside, and the concentration gradient is because there are more sodium ions outside the cell than inside, driving diffusion of sodium ions into the cell.

When a Membrane Is at Rest, What Attracts Sodium Ions