Which of the following statements is incorrect about skeletal muscle fibers?
Correct answer: C. They contain O2 storing molecules called hemoglobin.
- A. They are multinucleated.
- B. They are 10 - 100 ?m in diameter & surrounded by sarcolemma
- C. They contain O2 storing molecules called hemoglobin.
- D. Their cytoplasm contains high concentration of carbohydrates
Explanation
Skeletal muscle fibres contain myoglobin, an oxygen-storing pigment, rather than haemoglobin, which is the oxygen-carrying protein in red blood cells. Students may choose a statement about multinucleation or fibre diameter, but those descriptions are typical features of skeletal muscle fibres.
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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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