Which energy system is responsible for delivering 2-3 ATP?

The anaerobic glycolysis energy system is responsible for producing ATP quickly when oxygen is not readily available, making it crucial for high-intensity activities that last from about 30 seconds to 2 minutes. During this process, glucose is broken down to generate ATP. This system produces a net gain of 2 molecules of ATP per molecule of glucose, which is key for short bursts of activity such as sprinting or heavy lifting.

Anaerobic glycolysis activates rapidly and provides energy without the need for oxygen, but it ultimately results in the production of lactic acid, which can contribute to muscle fatigue. This is in contrast to other energy systems which serve different roles; for instance, the ATP-CP system provides immediate energy but depletes quickly and mainly fuels short-lasting efforts (about 10 seconds), while aerobic glycolysis and oxidative phosphorylation are associated with the production of greater amounts of ATP but through a longer process that requires oxygen.