E. sa Of the three types of muscle tissue, which has multinucleated fibers? A. s
ID: 272569 • Letter: E
Question
E. sa Of the three types of muscle tissue, which has multinucleated fibers? A. smooth muscle B. skeletal muscle C. cardiac muscle D. both smooth and skeletal muscles E. both cardiac and smooth muscles 1. 1. Whe tern A. B. ne C. th 2. Of the three types of muscle tissue, which is/are involuntary? A. smooth muscle B. cardiac muscle C. skeletal muscle D. both smooth and cardiac E. both cardiac and skeletal 8. 3. One sarcomere A. extends from Z line to Z line. B. is composed of many myofibrils. C. contains only actin fibers. D. is composed of many muscle fibers. E. surrounds each muscle in the body. 9 4. What ion is responsible for initiating muscle contraction? A. Mg2+ B. Cl- C. H+ D. Ca2+ E. Na+ 5. The thick filament of a myofibril is A. Actin B. Tubulin C. Myosin D. Troponin E. T tubules 6. What is the name of the small gap that separates the axon terminal of a nerve from the sarcolemma? A. T tubule B. sliding filament C. synaptic vesicleExplanation / Answer
1) The correct option is B. cardiac muscle.
Skeletal muscle has multiple bundles of cells known as muscle fibers.
2) The correct option is D. both smooth and cardiac.
Smooth and cardiac muscle both contract involuntarily. Cardiac muscle cells are present in the walls of the heart and are under involuntary control. Smooth muscle fibers are present in walls of hollow visceral organs and are also under involuntary control.
3) The correct option is A. extends from Z line to Z line.
A sarcomere is the basic unit of striated muscle tissue. It is the repeating unit between two Z lines.
4) The correct option is D. Ca2+.
Calcium ions are responsible for initiating muscle contraction. These ions are an intracellular signalling molecule for muscle contraction.
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