Which of the following causes the appearance of the Z line? Question 19 options: proteins joining thin filaments of adjacent sarcomeres to each other the absence of thick filaments proteins anchoring thick filaments to the cell cytoskeleton the presence of thick filaments
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The Z line (or Z disc) is a structure in muscle cells that marks the boundary between adjacent sarcomeres, which are the basic contractile units of muscle tissue. Show more…
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In muscle fiber in a completely relaxed state: a. sarcomeres are regions between two H zones. b. discs of M line proteins called the A band separate the thick filaments. c. I bands are composed of the same thick filaments seen in the A bands. d. Z lines are adjacent to H zones, which attach thick filaments. e. dark A bands contain overlapping thick and thin filaments with a central thin H zone composed only of thick filaments.
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