Cardiac muscles of frog are identified under the microscope by the presence of
Correct answer: A. Striations and branched fibres
- A. Striations and branched fibres
- B. Striations and unbranched fibres
- C. Multiple nuclei and unbranched fibres
- D. Multiple nuclei and branched fibres
Explanation
The correct answer is Option A: 'striations and branched fibres.' Cardiac muscle tissue is distinct for its striated appearance and branched fibers, which allow for strong and synchronized contractions. Unlike skeletal muscle, which has striations with unbranched and multinucleated fibers, cardiac muscle fibers are typically branched and contain a single nucleus per cell. Therefore, Options B, C, and D are incorrect due to their inaccurate descriptions of cardiac muscle characteristics.
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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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