Question

Why do pumps require energy?

Answer 1

Answer:

Pumps move substances from areas of low concentration to areas of high concentration. ... Pumps always move substances out of the cell.

Answer 2

Answer:

This type of protein pump moves ions across the cell membrane. … There is a high concentration of sodium ions (Na+) outside the cell membrane. Even so, the protein pump keeps forcing more and more sodium ions into that space. Because the movement of molecules is "forced", it requires energy (ATP).

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