AP BIOLOGY

Detailed explanation-1: -Phosphocreatine is known as its quickest form of regeneration, by means of the enzyme creatine kinase. Thus, the primary function of this system is to act as a temporal energy buffer.

Detailed explanation-2: -CK’s job is to add a phosphate group, a group of natural chemicals, to creatine, a substance in your muscle cells that helps your muscles produce energy. When CK adds phosphates to creatine, it turns the creatine into the high-energy molecule, phosphocreatine, which your body uses to generate energy.

Detailed explanation-3: -Phosphocreatine can be broken down into creatinine, which is then excreted in the urine. A 70 kg man contains around 120 g of creatine, with 40% being the unphosphorylated form and 60% as creatine phosphate. Of that amount, 1–2% is broken down and excreted each day as creatinine.

Detailed explanation-4: -What is it used for? A CK test is most often used to diagnose and monitor muscular injuries and diseases. These diseases include: Muscular dystrophy, a rare inherited disease that causes weakness, breakdown, and loss of function of skeletal muscles.

Detailed explanation-5: -Found in all vertebrates, creatine kinase catalyzes the reversible reaction of creatine and ATP forming phosphocreatine and ADP. Phosphocreatine may be viewed as a reservoir of “high-energy phosphate” which is able to supply ATP, the primary energy source in bioenergetics, on demand.