active transport
Post on 12-Jan-2016
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Active TransportActive Transport
• The movement of particles across the plasma membrane against the concentration gradient, that is from a region of low concentration to a region of high concentration.
• Active transport also requires specific carrier proteins that bind to the substance to be transported, enabling the substance to pass rapidly across the plasma membrane.
• Sometimes the carrier proteins are referred to biological pumps.
• Active transport requires an input of energy provided by ATP. So, it can only take place in living organism.
Sodium-potassium pumpSodium-potassium pump
Ion intake by root hairs of a plant
Mineral ions are absorbed across the membranes of the root hairs by active transport.
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