ATP is the abbreviation for adenosine triphosphate, the molecule used by animal cells for energy for their cells life processes. ATP is manufactured by the phosphorylation of an adenine and a ribose sugar. It is produced as AMP (adenosine monophosphate), ADP (adenosine diphosphate), and the end product, ATP (adenosine triphosphate). The human body, on average, only contains about 250 grams (8.8 ounces) of ATP, but cycles its own body weight in ATP every twenty-four hours. ATP is manufactured by the mitochondrion through a process known as cellular respiration. The two anhydride bonds, between two of the phosphate molecules, are high energy bonds. The hydrolyzing of these two bonds release energy that is available to the cell to facilitate its life processes that require energy, such as the transportation of various substances within the cell and across the cell membrane. Anything that requires energy may satisfy its energy needs by the constant construction and destruction of the adenosine triphosphate molecule.