IGCSE Biology 0610

3.3 Active Transport

• Active transport is the 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 from respiration
• Active transport is important as it is a process for movement of molecules/ions across membranes. An example of active transport is ion uptake by root hairs, where diffusion is ineffective as the inside of the root has more ions than the outside.
• During active transport, protein carriers move molecules or ions across a membrane