2. When a cell is at rest: A. enough negatively charged sodium ions are kept outside
of the cell to maintain a slightly positive charge inside.
B. there is an equal balance of positive and negative
charges inside and outside the cell, so it is unable to fire
quickly.
C. there is an equal balance of positive and negative
charges inside and outside the cell, so it is able to fire
quickly.
OD. enough positively charged sodium ions are kept outside
of the cell to maintain a slightly negative charge inside.
O