What is the basic unit of muscle fibre?
Correct answer: A. myofibril
- A. myofibril
- B. Z-line
- C. M-line
- D. Fibroin
Explanation
Correct option:A(Definition) The basic unit of muscle fiber is the myofibril. Myofibrils are long cylindrical structures found within muscle fibers that are responsible for muscle contraction. They are composed of repeating units called sarcomeres, which contain the contractile proteins actin and myosin.
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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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