Skeletal muscle is composed of cells collectively referred to as:
Correct answer: B. Muscle fibers
- A. Muscle fibrin
- B. Muscle fibers
- C. Sarcomere
- D. None of these
Explanation
Muscle contraction occurs when sarcomeres within muscle fibers shorten. This process is triggered by the release of calcium ions, which allows myosin and actin filaments to interact, generating force and causing the muscle to contract. The contraction enables the muscles to move, apply force, and perform various functions in the body.
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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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