<prompt> Which energy molecule gives 10.5kcalmolecule?ATPGTPCreatine phosphateGlucose-6-phosphate  <response>: Creatine Phosphate Phosphocreatine Creatine phosphate or CP provides a high energy reservoir of ATP to regenerate ATP rapidly by the Lohmanns reaction, catalyzed by creatine kinase. ATP Creatine Phosphocreatine ADP DG0 43.1 kJmol -10.5 kcalmol. The reaction is mitochondrial and of special significance in the myocardium which has a high energy requirement, about 6 kg of ATP per day. Energy transfer to the heas myofibrils is by creatine kinase energy shuttle, since being a smaller molecule than ATP, CP can rapidly diffuse from the myocardium to the myofibrils. Storage forms of high energy phosphates, such as creatine phosphate and arginine phosphate are called Phosphagens. Creatine phosphate is mainly seen in skeletal muscle, hea, and brain.Ref: DM Vasudevan Textbook of Medical Biochemistry, 6th edition, page no: 227 