Topics:
Animal Physiology, Animal Refresher
Energy Source During Strenuous Exercise up to 10 Seconds
During strenuous exercise up to 10 seconds, the energy comes from:
- Creatine phosphate (CP) — Correct Answer
- Fat
- Glucose
- Protein
Explanation:
Correct Answer: Creatine Phosphate (CP)
During strenuous exercise lasting up to 10 seconds (after the initial 4-second ATP phase), energy is supplied by Creatine Phosphate (CP) via the ATP-CP (phosphagen) system. Creatine kinase rapidly transfers the phosphate group from CP to ADP to regenerate ATP.
Reaction:
Creatine-PO₄ + ADP → ATP + Creatine (catalyzed by Creatine kinase)
ATP-CP System Features
- Anaerobic (no oxygen required).
- Fastest energy replenishment system.
- Very limited capacity — exhausted within 10 seconds.
- Used for explosive, high-intensity activities (sprints, jumps, throws).
Why Other Options Are Wrong
- Fat → Used in prolonged aerobic exercise (>2 minutes); too slow for intense short-burst activity.
- Glucose → Part of glycolytic (lactic acid) system; takes longer to produce ATP than CP system.
- Protein → Last resort fuel used only during prolonged starvation; not used in short exercise bursts.
📚 About this Topic — Animal Physiology
This multiple choice question is from Animal Physiology, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Physiology to strengthen your preparation.
