Q.

"Sodium Pump" operates in -

A. Muscle contraction
B. Heart beat
C. Nerve impulse
D. None of the above
Answer» C. Nerve impulse
Explanation: Na+/K+-ATPase (also known as sodium-potassium pump) is an enzyme located in the plasma them brane 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 voltagegated, which means that they can open and close depending on the voltage across the membrane.
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