Which of the following is true about skeletal muscle? A. In the muscle fibre, actin is the thick filament. B. The sarcoplasmic reticulum regulates the level of Ca ^2 + within a muscle cell. C. Unlike a nerve cell, a muscle cell does not possess an excitable membrane. D. In a muscle fibre, myosin is the thin filament. E. Contraction of a muscle fibre can occur in the absence of Ca ^2 + .
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In the muscle fibre, actin is the thin filament, not the thick filament. Show more…
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Which of the following statements is true? a. A muscle fiber is a collection of cells embedded in connective tissue. b. A sarcomere contains both actin and myosin molecules arranged in a parallel fashion. c. The function of Ca2+ in contraction is to bind to tropomysin. d. Myofibrils are individual muscle cells. e. The I band of a sarcomere is the region where thin and thick filaments overlap.
Which statement about the structure of skeletal muscle is true? a. The light bands of the sarcomere are the regions where actin and myosin filaments overlap. b. When a muscle contracts, the A bands of the sarcomere lengthen. c. The myosin filaments are anchored in the Z lines. d. When a muscle contracts, the H zone of the sarcomere shortens. e. The sarcoplasm of the muscle cell is contained within the sarcoplasmic reticulum.
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