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Illustration of a model for the potassium and sodium ion channels through pores in the plasma membrane of an animal nerve cell an example of active transport, where solutes (ions, sugars, amino acids) are pumped into cells from a region of lower to higher concentration. This is a reverse of free diffusion, where molecules move from higher to lower concentrations, that is, down the concentration gradient. The sodium/potassium exchange pump is described here sodium ions (Na+, red spheres) are being actively pumped out of the cell in a compulsory exchange for potassium ions (K+, blue spheres) entering the cell.
May 11th, 2013
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