Active transport is the movement of particles with the aid of external energy. An example is the Na+/K+ pump. Compare to passive transport.

Transport of ions, nutrients or other molecules into a cell against a concentration gradient; this requires the expenditure of energy through ATP hydrolysis.

From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.

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