what is the source of energy used to power the sodium potassium pump
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It is necessary to transport sodium back out and potassium back in, against their electrochemical gradient. This task is carried out by sodium-potassium pump, which transports three sodium ions out across the cell membrane for every two potassium ions carried inward. The source of energy for this transport process was hydrolysis of ATP.
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The sodium-potassium pump carries out a form of active transport—that is, its pumping of ions against their gradients requires the addition of energy from an outside source. That source is adenosine triphosphate (ATP), the principal energy-carrying molecule of the cell.
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