1- How do ions move from low concentration to high concentration? (Against a concentration gradient)
|Using cellular energy (ATP)|
|Passively, by diffusion|
2- Sodium (Na+) is more concentrated outside of cells than inside cells. What would happen if the cell membrane permeability to sodium suddenly changed?
|Sodium rushes into the cell passively (net inward movement)|
|Sodium rushes out of the cell passively (net movement outward)|
Nothing – sodium still does not cross the cell membrane