PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The thin filaments are firmly attached to
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M-line
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A-line
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Z-line
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I-line
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Explanation:
Detailed explanation-1: -Thin filaments are firmly attached to the M-line. c. The central part of thick filaments, not overlapped by thin filaments is called Z-band.
Detailed explanation-2: -Thin filaments attach to a protein in the Z disc called alpha-actinin and occur across the entire length of the I band and partway into the A band.
Detailed explanation-3: -Actin molecules are bound to the Z-line, which forms the borders of the sarcomere. Other bands appear when the sarcomere is relaxed. The myofibrils of smooth muscle cells are not arranged into sarcomeres.
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