How does the activity of NaK ATPase contribute to the electrochemical gradient across the cell membrane?

• A. By transporting equal numbers of sodium and potassium ions, maintaining a neutral charge.
• B. By transporting more sodium ions into the cell than potassium ions out, creating a net positive charge inside.
• C. By transporting more potassium ions out of the cell than sodium ions in, creating a net negative charge outside.
• D. By transporting more sodium ions out of the cell than potassium ions in, creating a net positive charge outside.

Answer: (D)