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Biology 21 Online
OpenStudy (anonymous):

Normal homeostatic conditions require potassium concentrations to be about 1000 times higher inside the cell than in the blood. What mechanism does a cell use to move these small potassium molecules into the cell against the concentration gradient? passive transport by osmosis passive transport by diffusion active transport by endocytosis active transport by proteins

OpenStudy (anonymous):

Active Transport by Proteins :)

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