Which type of muscle is striated but under involuntary control?
Correct answer: A. Cardiac muscle
- A. Cardiac muscle
- B. Skeletal muscle
- C. Smooth muscle
- D. None of the three
Explanation
Cardiac muscle has the cross striations of skeletal muscle because it uses the same actin and myosin arrangement, but it contracts rhythmically on its own without conscious control and its fibres are branched and joined by intercalated discs. Skeletal muscle is striated and voluntary, and smooth muscle is involuntary but has no striations, so cardiac muscle is the only combination of both features.
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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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