Fatigue-free muscles are:
Correct answer: C. Cardiac
- A. Striped
- B. Unstriped
- C. Cardiac
- D. Triceps
Explanation
The correct answer is 'Cardiac' because cardiac muscles are uniquely adapted to contract continuously throughout a person's life without tiring. They have a high density of mitochondria, which provides the energy needed for sustained activity. In contrast, striped (skeletal) muscles are voluntary and can fatigue with excessive use, unstriped (smooth) muscles can also fatigue under certain conditions, and the triceps are a specific group of skeletal muscles that can tire with activity.
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About Muscles
Muscles covers skeletal, smooth and cardiac muscle, their microscopic structure and the roles of tendons, myofibrils, actin and myosin. It explains the sliding filament mechanism, sarcomere shortening, neuromuscular transmission and calcium regulation, while distinguishing voluntary skeletal movement from involuntary contraction in smooth and cardiac muscle.
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