active transport

[ ak-tiv trans-pawrt ]

noun

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

active transport

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

active transport

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.

Word History and Origins

Origin of active transport¹

First recorded in 1960–65

Example Sentences

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

From Science Daily

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

From BBC

The remaining emissions can be dramatically reduced by encouraging a shift toward electric vehicles powered by clean energy sources and toward active transport, like walking and biking.

From Salon

"It's great if the first choice is to be public transport and active transport - but that does mean the government has to change radically investment."

From BBC

That politicians in Joensuu are committed to cycling, and active transport more generally, is clear from the Winter Cycling Congress.

From The Guardian