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active transport

Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The movement of a chemical substance through a gradient of concentration or electrical potential in the direction opposite to normal diffusion, requiring the expenditure of energy: active transport across a cell membrane.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient; requires an expenditure of energy

Etymologies

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