+Active transport is the cellular process that moves molecules across a [Cell Membrane](/wiki/Cell_Membrane) against their [Concentration Gradient](/wiki/Concentration_Gradient). This vital work requires metabolic [Energy](/wiki/Energy) to maintain essential cellular functions.
+## See also
+- [ATP](/wiki/ATP)
+- [Passive Transport](/wiki/Passive_Transport)
+- [Ion Pump](/wiki/Ion_Pump)
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