Adenosine Triphosphate (ATP) is a really important shortterm energy storage compound in cells. ATP contains three phosphates and when it is converted to Adenosine Diphosphate (ADP) a phosphate is removed and energy is released that cells can use for processes like movement, synthesis and active transport. Cells use ATP continuously, so after it is broken down it needs to be 'put back together'. This is why we the ATP Cycle is needed. To produce ATP from ADP + P energy is needed. This energy comes from cellular respiration (Aerobic Respiration or Fermentation). Find out more about Cellular Respiration by watching 'What is Aerobic Respiration' & 'What is Fermentation'. For more Biology video lessons check out www.anytimeeducation.com