Biology · Locomotion and Movement
A researcher studies two muscle samples: Muscle A: High myoglobin, dense mitochondria, slow contraction speed Muscle B: Low myoglobin, fewer mitochondria, rapid contraction, fatigues quickly Both muscles are subjected to high-frequency stimulation, leading to tetanus. However, Muscle B fatigues rapidly while Muscle A sustains contraction. Which explanation best accounts for this difference?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Muscle B lacks sarcoplasmic reticulum, preventing calcium release
- 2Muscle A has longer sarcomeres, leading to greater force generation
- 3Muscle B cannot generate action potentials at high frequency due to lack of myoglobin
- 4Muscle A maintains higher ATP due to aerobic metabolism, allowing sustained Ca2+ reuptake and release✓
Correct answer
Muscle A maintains higher ATP due to aerobic metabolism, allowing sustained Ca2+ reuptake and release
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