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: '''Active transport''' is an essential process for all [[Alive|living]] [[organism]]s. It is used to take in [[nutrient]]s when there is not a high enough [[concentration]] to [[Diffusion|diffuse]] into the [[organism]].
: '''Active transport''' allows [[organism]]s to take in [[nutrient]]s more quickly and in greater quantities than [[diffusion]].
: '''Active transport''' takes place across the [[Cell Membrane|cell membrane]] where there are special [[protein]] [[molecule]]s which act as pumps to move [[substance]]s from one side of the [[Cell Membrane|cell membrane]] to the other. Since the [[Cell Membrane|cell membrane]] is [[Partially Permeable Membrane|selectively permeable]] those [[substance]]s cannot [[Diffusion Across a MembraneExchange Surface|diffuse]] back again.