Title: Phosphocreatine
Content:  Phosphocreatine, also known as creatine phosphate (CP) or PCr (Pcr), is a phosphorylated creatine molecule that serves as a rapidly mobilizable reserve of high-energy phosphates in skeletal muscle, myocardium and the brain to recycle adenosine triphosphate, the energy currency of the cell.
Title: Creatine phosphate shuttle
Content:  Due to the high concentration of ATP around the mitrochondrial creatine kinase, it will convert ATP into PCr which will then move back out into the cells cytoplasm to be converted into ATP (by cytoplasmic creatine kinase) to be used as energy for muscle contraction. In some vertebrates, arginine phosphate plays a similar role. Creatine supplementation is an effective method of increasing an athlete's power output. Once the molecule is ingested it accumulates in muscle cells where it can be phosphorylated, increasing the pool of phosphocreatine available for contractile power before it is depleted and other energy systems must be used. The result is increased performance in short-term high intensity activities such as sprinting or weightlifting.
Title: Creatine phosphate shuttle
Content:  The creatine phosphate shuttle is an intracellular energy shuttle which facilitates transport of high energy phosphate from muscle cell mitochondria to myofibrils. This is part of phosphocreatine metabolism. In mitochondria, Adenosine triphosphate (ATP) levels are very high as a result of glycolysis, TCA cycle, oxidative phosphorylation processes, whereas creatine phosphate levels are low. This makes conversion of creatine to phosphocreatine a highly favored reaction. Phosphocreatine is a very-high-energy compound. It then diffuses from mitochondria to myofibrils. In myofibrils, during exercise (contraction) ADP levels are very high, which favors resynthesis of ATP. Thus, phosphocreatine breaks down to creatine, giving its inorganic phosphate for ATP formation. This is done by the enzyme creatine phosphokinase which transduces energy from 
Title: Phosphocreatine
Content:  Phosphocreatine can anaerobically donate a phosphate group to ADP to form ATP during the first five to eight seconds of a maximal muscular effort. Conversely, excess ATP can be used during a period of low effort to convert creatine back to phosphocreatine. The reversible phosphorylation of creatine (i.e., both the forward and backward reaction) is catalyzed by several creatine kinases. The presence of creatine kinase (CK-MB, creatine kinase myocardial band) in blood plasma is indicative of tissue damage and is used in the diagnosis of myocardial infarction. The cell's ability to generate phosphocreatine from excess ATP during rest, as well as its use of phosphocreatine for quick regeneration of ATP during intense activity, provides a spatial and temporal buffer of ATP concentration. In other words, phosphocreatine acts as high-energy reserve in a coupled reaction; the energy given off from donating the phosphate group is used to regenerate the other compound - in this case, ATP. Phosphocreatine plays a particularly important role in tissues that have high, fluctuating energy demands such as muscle and brain.
Title: Substrate-level phosphorylation
Content:  In working skeletal muscles and the brain, Phosphocreatine is stored as a readily available high-energy phosphate supply, and the enzyme creatine phosphokinase transfers a phosphate from phosphocreatine to ADP to produce ATP. Then the ATP releases giving chemical energy. This is sometimes erroneously considered to be substrate-level phosphorylation, although it is a transphosphorylation.
Title: Phosphocreatine
Content:  (ATP). This process is an important component of all vertebrates' bioenergetic systems. For instance, while the human body only produces 250 g of ATP daily, it recycles its entire body weight in ATP each day through creatine phosphate. 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. Phosphocreatine is used intravenously in hospitals in some parts of the world for cardiovascular problems under the name Neoton, and also used by some professional athletes, as it is not a controlled substance.
Title: Phosphocreatine
Content:  In the kidneys, the enzyme AGAT catalyzes the conversion of two amino acids — arginine and glycine — into guanidinoacetate (also called glycocyamine or GAA), which is then transported in the blood to the liver. A methyl group is added to GAA from the amino acid methionine by the enzyme GAMT, forming non-phosphorylated creatine. This is then released into the blood by the liver where it travels mainly to the muscle cells (95% of the body's creatine is in muscles), and to a lesser extent the brain, heart, and pancreas. Once inside the cells it is transformed into phosphocreatine by the enzyme complex creatine kinase. Phosphocreatine is able to donate its phosphate group to convert adenosine diphosphate (ADP) into adenosine 
Title: Creatine
Content:  Creatine is a naturally occurring non-protein compound of which the primary metabolic role is to combine creatine with a phosphoryl group to generate phosphocreatine, which is used to regenerate ATP or adenosine triphosphate. Most of the human body's total creatine and phosphocreatine stores are found in skeletal muscle (95%), while the remainder is distributed in the blood, brain, testes, and other tissues. The average amount of total creatine (creatine and phosphocreatine) stored in the body is approximately 120 mmol/kg of dry muscle mass. However, the upper limit of creatine storage post supplementation and dietary intervention is believed to be around 160 mmol/kg. Studies have also shown that 1–2% of intramuscular creatine is degraded per day and an individual would need to consume about 1–3 grams of creatine per day to maintain average (unsupplemented) creatine storage. For most individuals about half (1 g/day) of this daily need is consumed from an omnivorous diet, while the remaining amount is synthesized in the liver and kidneys.
Title: Creatine phosphate shuttle
Content:  transport molecule of phosphocreatine to the useful molecule for contraction demands, ATP, an action performed by ATPase in the myofibril. The resulting creatine product acts as a signal molecule indicating myofibril contraction and diffuses in the opposite direction of phosphocreatine, back towards the mitochondrial intermembrane space where it can be rephosphorylated by creatine phosphokinase. At the onset of exercise phosphocreatine is broken down to provide ATP for muscle contraction. ATP hydrolysis results in products of ADP and inorganic phosphate. The inorganic phosphate will be transported into the mitochondrial matrix, while the free creatine passes through the outer membrane where it will be resynthesised into PCr. The antiporter transports the ADP into the matrix, while transporting ATP 
Title: Creatine
Content:  Creatine is transported through the blood and taken up by tissues with high energy demands, such as the brain and skeletal muscle, through an active transport system. The concentration of ATP in skeletal muscle is usually 2–5 mM, which would result in a muscle contraction of only a few seconds. During times of increased energy demands, the phosphagen (or ATP/PCr) system rapidly resynthesizes ATP from ADP with the use of phosphocreatine (PCr) through a reversible reaction catalysed by the enzyme creatine kinase (CK). The phosphate group is attached to an NH center of the creatine. In skeletal muscle, PCr concentrations may reach 20–35 mM or more. Additionally, in most muscles, the ATP regeneration capacity of CK is 

Question: where is creatine phosphate found in the body?
Answer: brain.
pancreas.
skeletal muscle and the brain.
muscle cells.
heart.