active transport

Noun
  1. Transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient;
    Requires an expenditure of energy (synset 113447899)
    referred to in: drug - a substance that is used as a medicine or narcotic
    is a type of: transport - an exchange of molecules (and their kinetic energy and momentum) across the boundary between adjacent layers of a fluid or across cell membranes

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