a high-energy molecule in skeletal muscle fibers (cells); phosphocreatine breaks down into creatine, phosphate, and energy; the energy is used to generate ATP from ADP

an organic compound of creatine and phosphoric acid; found in the muscles of vertebrates where its hydrolysis releases energy for muscular contraction

Phosphocreatine, also known as creatine phosphate or PCr, is a phosphorylated creatine molecule that is an important energy store in skeletal muscle. It is used to generate ATP from ADP, forming creatine for the 2 to 7 seconds following an intense effort. This reaction is reversible and it therefore acts as a spatial and temporal buffer of ATP concentration.