Allentown is 50 miles (80 km) north-northwest of Philadelphia, the fifth most populous city in the United States, 90 miles (140 km) east-northeast of Harrisburg, the state capital, and 90 miles (140 km) west of New York City, the nation's largest city.
Mitochondria is the organelle that uses energy from organic compounds like pyruvate to make ATP, or adenosine triphosphate.
ATP and creatine phosphate (or phosphocreatine, or PCr) make up the ATP-PCr system. it is the immediate energy system. Creatine phosphate (PCr) is a high-energy compound. When evercise intensity is high, or energy needs are instantaneous, creatine phosphate stored in muscle is broken down to provide energy to make ATP.hen ATP is broken down, it gives energy for muscle contraction. It is the only molecule that can supply the energy used in the contraction of muscle fibres and can be made in three ways: the creatine phosphate system which is also called Phosphocreatine, the lactic acid energy system and the aerobic energy system.