AP BIOLOGY

Detailed explanation-1: -These ATP stores last only a few seconds after which the breakdown of PC provides energy for another 5-8 seconds of activity. Combined, the ATP-PC system can sustain all-out exercise for up to 10-15 seconds and it is during this time that the potential rate for power output is at its greatest.

Detailed explanation-2: -All muscle cells have a little ATP within them that they can use immediately – but only enough to last for about 3 seconds! So all muscle cells contain a high-energy compound called creatine phosphate which is broken down to make more ATP quickly.

Detailed explanation-3: -(Adenosine triphosphate, or ATP, is the way your body uses biochemicals to store and use energy.) Then the phosphagen system kicks in. (ATP and creatine phosphate levels working together form the phosphagen system.) This supplies energy for 8 to 10 seconds.

Detailed explanation-4: -As an intermediate pathway between the phosphagen and aerobic system, anaerobic glycolysis can produce ATP quite rapidly for use during activities requiring large bursts of energy over somewhat longer periods of time (30 seconds to three minutes max, or during endurance activities prior to steady state being achieved).