How long does the ATP-CP system provide energy for?

The ATP-CP system, also known as the phosphagen system, primarily serves as the immediate source of energy for high-intensity activities that last from 0 to about 10 seconds. This system relies on adenosine triphosphate (ATP) and creatine phosphate (CP) stored in the muscles to quickly regenerate ATP, allowing for explosive movements such as sprinting or heavy lifting.

The key aspect of this system is its rapid availability of energy, supporting short bursts of high-intensity performance before fatigue sets in. Beyond this time frame, typically after about 10 seconds, the body's reliance shifts to other energy pathways, such as anaerobic glycolysis and aerobic metabolism, which are better suited for sustained efforts.

Therefore, the correct answer highlights the duration that the ATP-CP system effectively provides energy before other systems take over.