active transport

American  

[ak-tiv trans-pawrt] / ˈæk tɪv ˈtræns pɔrt /

noun

1. the movement of ions or molecules across a cellular membrane from a lower to a higher concentration, requiring the consumption of energy.

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active transport British  

noun

1. biochem physiol a process by which molecules are enabled to pass across a membrane from a region in which they are in a low concentration to one of high concentration; this requires the expenditure of energy in metabolism and is assisted by carrier proteins, commonly referred to as pumps

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active transport Scientific  

1. 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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Etymology

Origin of active transport

First recorded in 1960–65

Example Sentences

See Examples For:

active transport

The project, she added, would result in "clear degradation of the rural environment" and would not be accessible on foot or by bike, thus doing "little to achieve" council active transport goals.

From BBC ● Jun. 11, 2026

The researchers think that the animals' use of internal energy, or active transport, when moving the salts could be the explanation.

From Science Daily ● Oct. 6, 2023

Mr Azhar said a partnership approach, involving authorities and employers, was needed to promote healthy, affordable food, active transport and green spaces.

From BBC ● May 25, 2023

Because active transport mechanisms depend on cellular metabolism for energy, they are sensitive to many metabolic poisons that interfere with the supply of ATP.

From Textbooks ● Apr. 25, 2013

Each inactive tape transport requires two amperes and the one active transport requires 10 amperes.

From Preliminary Specifications: Programmed Data Processor Model Three (PDP-3) October, 1960 by Digital Equipment Corporation