Which of the following energy systems is anaerobic?

The glycolytic energy system is considered anaerobic because it does not require oxygen to produce ATP, which is the primary energy currency of the body. This system primarily utilizes carbohydrates stored in the muscles and bloodstream to generate energy quickly during high-intensity activities that last from approximately 30 seconds to 2 minutes.

In contrast, the fatty acid/oxidative system, which is an aerobic process, relies on oxygen to metabolize fats and carbohydrates for sustained energy during lower-intensity, prolonged activities. The ATC-CP (adenosine triphosphate-creatine phosphate) system also functions anaerobically, providing immediate energy for short bursts of high-intensity efforts, but it is generally classified separately from glycolysis.

In this case, since the question is specifically about anaerobic energy systems, the glycolytic system is the correct choice, with the understanding that the ATC-CP system also fits under the anaerobic category, but the focus here is on glycolysis.