Grade Saved


Your grade

Active transport





Active transport: Movement of particles through a cell membrane, ...

... from a region of lower concentration to a region of higher concentration ...

... against a concentration gradient, using energy released during respiration [1]

Differences between Active transport, Diffusion and Osmosis

BBC Bitesize - Active transport


How does it occur

Sometimes dissolved molecules are at a higher concentration inside the cell than outside, but, because the organism needs these molecules, they still have to be absorbed.

Carrier proteins pick up specific molecules and take them through the cell membrane against the concentration gradient. [2]


- uptake of glucose by epithelial cells in the villi of the small intestine

- uptake of ions from soil water by root hair cells in plants [3]


[1] From Znotes CIE IGCSE Biology - 3.3 Active Transport



You may be interested in

© 2017