ATP in muscle cells

... Describe how different metabolic pathways keep muscle cells supplied with ATP during exercise. Why are different pathways needed for anaerobic and aerobic work? Because the body cannot easily store ATP (and what is stored gets used up within a few seconds), it is necessary to continually create ATP during exercise. In general, the two major ways the body converts nutrients to energy are aerobic metabolism (with oxygen) and anaerobic metabolism (without oxygen). These two pathways can be further divided. Most often it's a combination of energy systems that supply the fuel needed for exercise, with the intensity and duration of the exercise determining which method gets used when. ATP-CP Anaerobic Energy Pathway/ The Phosphate System This pathway supplies around 10 seconds worth of energy and is used for short bursts of exercise such as a 100 meter sprint. This pathway doesn't requite any oxygen to create ATP. It first uses up any ATP

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