D. The region of the myofibrils between the two successive Z discs. it is the fu

Question

D. The region of the myofibrils between the two successive Z discs. it is the fu E. It is a long cylindrical cell with multiple oval nuclei just beneath its sarcolem 19. - Incorrect approach about the degree of muscular response A. B. C. D. E. Increase frequency of muscle stimulation increase muscle response Increase # muscle cells-being stimulated increase muscle response Decrease # muscle cells,being stimulated increase muscle response Decrease # muscle cells-being stimulated decrease muscle response Decrease frequency of muscle stimulation Decrease muscle response 20. - One of the events does not correspond to the contraction of the sarcomere A. Thin filaments slide past thick ones so they overlap more B. The X disc Shorten C. The H zones Disappears D. Te contiguous A bands closer together. E. The X disc stretch 21. - Choose which the best description of Sternocleidomastoid Muscle is A. It originates in Manubrium of sternum and medial portion of clavicle and ins

Explanation / Answer

Answer : (E). The X disc Stretch.

Reason: The muscle contraction is caused by the actin filament sliding past myosin filament. The A band contain thick filament of Myosin and I band is rich in thinner band made of actin. The ideal length of a sacromere to produce maximal tension occurs when all of the thick and thin filament overlaps. If the scaromere is stretched this past length some of the myosin head in the thick filament are not in contact with the actin in thin filament and less cross bridges were formed. As a result, less tension is produced because of fewer myosin head pulling of actin. If the muscle were stretched at the point where thick and thin filament do not overlap at all, no cross bridges are formed, no tension is produced.

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