Energy system of Type 2 fibres is anaerobic.

• A. Both
• B. Anaerobic
• C. Aerobic
• D. None

Answer: (B)

Fast-twitch Type 2 fibres are built for quick, powerful actions, so they rely on energy production without oxygen. The immediate supply comes from the ATP-PC system, followed by anaerobic glycolysis for slightly longer bursts. Both pathways occur without oxygen and produce ATP rapidly, which is why these fibres are described as anaerobic. This quick, high-intensity energy comes at the cost of faster fatigue from lactate buildup, unlike slow-twitch fibres that primarily use aerobic metabolism. While some Type 2 fibres (especially Type IIa) can use aerobic pathways to some extent during longer efforts, the characteristic energy supply for the fast, explosive work they are suited to is anaerobic.