pdh notes engergy systems

Topics: Adenosine triphosphate, Muscle, Metabolism Pages: 3 (702 words) Published: March 18, 2014

ATP/PC (without oxygen)
LACTIC ACID (without oxygen)
What is it?
The alactacid system (ATP/PC) uses the stored ATP modules in the muscles, for a few seconds or one explosive moment. The ATP molecule is then unable to provide energy to the working muscles. To continue the muscular movement , the body relies on creatine phosphate (PC) in a secondary reaction. This system is used for short bouts of exercise. Especially those lasting up to 12 seconds. the lactic acid system will continue providing ATP molecules to create required energy. This system produces lactic acid as a waste product in the chemical breakdown of glucose and glycogen (glycolysis). After lactic acid system has used all PC, body needs to find a new fuel in the form of blood glucose or glycogen stored in the muscle to keep going. Lactic acid then builds up in the cell and is transferred into the blood stream where the body tries to get rid of. Requires oxygen to make the ATP molecules needed for exercise, known as a steady state exercise. Because the energy demands meet the energy being supplied by the body. As the oxygen is transferred around the body via the circulatory system, it eventually reaches the working muscles. As the body reaches its anaerobic threshold, the body starts to slow down and the oxygen has time to reach the working muscles and change pyruvic acid into carbon dioxide , water and ATP. This results no more lactic acid being produced due to the presence of oxygen. Source of fuel

Process of rensythesis of ATP goes on continually until the creatine phosphate molecules are broken down, which normally takes between 10-12 seconds. creatine phosphate thus provides the fuel for the alactacid system. Carbohydrate in the form of sugar traveling in the blood stream (blood glucose) and the glycogen stored in the muscles (glycogen). The fuel for the aerobic system is primarily glucose and free fatty acids. Efficiency

Efficient form of energy as chemical reactions...
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