The energy needed to "pump" sodium outside the cell in active transport is

Adenosine triphosphate (also called ATP) is used by the cell as fuel to pump sodium out of the cell during the process of active transport. It carries energy to the areas of the body where it is needed. It is necessary for many of the cell's functions and is an important part of metabolism.

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The answer to your question is Adenosine triphosphate

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