Inside the cell membrane is a sodium potassium pump that needs ATP in order to pump sodium out of the cell and potassium inside.

细胞膜内的钠钾泵需要ATP供能，来把钠泵出细胞外，把钾泵入细胞内。

This is achieved by two mechanisms: excretion of potassium through the kidneys and intestines with the kidneys playing a predominant role, shifting of potassium from the extracellular fluid into the cells by the sodium potassium pump.

钾通过肾脏和肠道排泄，肾脏起主要作用，钾通过钠钾泵从细胞外液转移到细胞内。