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BIO NMDCAT Muscles
nmdcat.online July 28, 2026

In living organisms, the energy required for a sudden, intense burst of skeletal muscle activity (lasting about 10-15 seconds) is primarily derived from:

A. Aerobic respiration of glucose
B. Lactic acid fermentation
C. Direct phosphorylation of ADP by creatine phosphate
✓
D. Beta-oxidation of fatty acids

📝 Explanation

For short, intense bursts of energy, skeletal muscle relies on the phosphagen system. Creatine phosphate stores high-energy phosphate bonds that can quickly be transferred to ADP to regenerate ATP, providing immediate energy before glycolysis fully kicks in.

📖 Additional Information

  • Aerobic respiration of glucose
  • Lactic acid fermentation
  • Direct phosphorylation of ADP by creatine phosphate
  • Beta-oxidation of fatty acids

For short, intense bursts of energy, skeletal muscle relies on the phosphagen system. Creatine phosphate stores high-energy phosphate bonds that can quickly be transferred to ADP to regenerate ATP, providing immediate energy before glycolysis fully kicks in.

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