Active-transport definition

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.

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The passage of ions or molecules from one side of a cell membrane to another in opposition to inhibiting conditions, as osmotic equilibrium, by means of energy released in cell metabolism.
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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.

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The movement of ions or molecules across a cell membrane in the direction opposite that of diffusion, that is, from an area of lower concentration to one of higher concentration. Active transport requires the assistance of a type of protein called a carrier protein, using energy supplied by ATP.
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