Correct Option: C

Na+/K+-ATPase (also known as sodium-potassium pump) is an enzyme located in the plasma membrane of virtually every human cell and is common to all cellular life. In nerve and muscle cells the membranes are electrically excitable, which means that they can change their membrane potential, and this is the basis of the nerve impulse. The sodium and potassium channels in these cells are voltage-gated, which means that they can open and close depending on the voltage across the membrane.