Which is the common feature between cardiac and smooth muscles?
Correct answer: B. Involuntary
- A. Voluntary
- B. Involuntary
- C. Branched
- D. Unbranched
Explanation
Both contract without conscious control, cardiac muscle beating rhythmically on its own and smooth muscle working the gut, blood vessels and other hollow organs. They differ in almost everything else: cardiac fibres are branched and striated while smooth fibres are unbranched and non striated, which is why the third and fourth options each apply to one but not both. Only skeletal muscle is voluntary.
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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