The Phosphagen Pathway is also known as which energy system?

• A. Aerobic Energy System
• B. Ketogenic Energy System
• C. Anaerobic Energy System
• D. Substrate-level Phosphorylation Energy System

Answer: (C)

The Phosphagen Pathway is the immediate energy system that uses phosphocreatine to rapidly regenerate ATP from ADP. It powers very short, maximal efforts and operates without oxygen, making it anaerobic. That quick, oxygen-free ATP supply is the hallmark of the anaerobic energy system, which is why this option fits best.

Aerobic energy system requires oxygen and supports longer, lower-intensity activity, so it isn’t the right label. Ketogenic energy system isn’t a standard term for the main energy systems. Substrate-level phosphorylation describes a mechanism used within energy production but isn’t the official name of the phosphagen pathway itself.