ATP is adenosine triphosphate composed of a nitrogenous base (adenine), the sugar (ribose), and the triphosphate.
Energy used by the body to perform muscular contractions and many other energy-required functions is adenosine triphosphate or ATP. The most important function of ATP is its ability to store and transport chemical energy within cells. That energy can be used for many chemical processes such as muscle contraction, nerve impulse propagation, chemical synthesis.. When consumed in metabolic processes as an energy source, it becomes converted either to adenosine diphosphate (ADP) or to adenosine monophosphate (AMP) because one or two phosphate groups are released (hydrolysis of high-energy bonds). Since ATP is a nucleoside triphosphate it can be used for the synthesis of nucleic acids.