Adenosine Tri-Phosphate is a molecule responsible for energy transfer at a cellular level. Adenosine Tri-Phosphate is an adenosine molecule, with three phosphate molecules attached. When the bond between an adenosine molecule and a phosphate breaks, energy is released.

The break down of ATP produces energy used in respiration and metabolism. Without ATP, there would be no energy production, which would shut down all body functions. Muscles would not contract, the brain would not function, digestion would not occur, cells would not repair and regenerate. In short, without ATP we would cease to exist.
The body can resynthesise ATP using the ATP-PC system (initially), the Lactic Acid system (secondly) and the Aerobic System (thirdly).

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