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Active Transport - Physiology (view source)
Revision as of 11:26, 14 August 2008
, 11:26, 14 August 2008→Differant Types of Active Transport
==Differant Types of Active Transport==
==Differant Types of Active Transport==
===Primary Active Transport===
In primary active transport the main source of energy is ATP. The ATP is hydrolyzed to ADP by the protein releasing energy which powers the transport.
=====Example - Sodium=====
This allows the transport of sodium ions from the inside to the outside of the cell. This process requires energy as there is a lower concentration within the cell than outside. However it is essential to maintain the correct internal environment of the cell. The system also has to overcome the electrical gradient involved as the interior of cells is negatively charged thus attracting sodium.
=====Development of Potential Energy=====
When sodium is pumped out of cells against a concentration gradient it gathers potential energy. If ion channels are present to allow the sodium to re-enter the cell passively then this energy is released. It is this energy which is used to power. Secondary Active Transport
===Secondary Active Transport===
===Secondary Active Transport===