Which of the following characters is shared by both skeletal and cardiac muscles?
Correct answer: A. Presence of striation
- A. Presence of striation
- B. Involuntary control
- C. Multinucleated fibers
- D. Intercalated discs
Explanation
Both use the same regular arrangement of actin and myosin filaments, so both show cross striations under the microscope. They differ in control, skeletal being voluntary and cardiac involuntary, and intercalated discs and branching belong to cardiac muscle alone. Multinucleated fibres are a skeletal muscle feature.
This question appeared on the UHS MDCAT 2025 paper, which you can sit online with every answer explained.
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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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