AP BIOLOGY

Detailed explanation-1: -Combined, the ATP-PC system can sustain all-out exercise for up to 10-15 seconds if activity continues beyond this immediate period, the body must rely on other energy systems to produce ATP as the limited stores of both ATP and PC will be exhausted and will need time to replenish.

Detailed explanation-2: -The ATP-CP system is the system that is responsible for very short (i.e. 1-2 repetitions), explosive movements. This energy system is only good for about 6-10 seconds of activity.

Detailed explanation-3: -The first 10 to 20 seconds of high-intensity physical activity is fueled by the “ATP-CP, ” also known as the phosphagen energy system. Once the available ATP is used up, which occurs in a few seconds, a molecule called phosphocreatine is used to re-form ATP in the muscle.

Detailed explanation-4: -The anaerobic energy system (also called the lactic acid system) is the body’s way of creating energy in the form of ATP quickly. Primarily using glucose as fuel, this energy system powers the muscles anywhere from ten to thirty seconds for intense efforts.

Detailed explanation-5: -As the fastest way to resynthesize ATP, the phosphagen system is the predominant metabolic energy system used for all-out exercise lasting up to about 10 seconds. However, since there is a limited amount of stored CP and ATP in skeletal muscles, fatigue occurs rapidly.