active transport


noun

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

Origin of active transport

First recorded in 1960–65

British Dictionary definitions for active transport

active transport

noun

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

Medical definitions for active transport

active transport

n.

The passage of ions or molecules across a cell membrane against an electrochemical or concentration gradient, or against the normal direction of diffusion.

Scientific definitions for active transport

active transport

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.