MUSCLE
SMOOTH MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following marks the end of a sarcomere?
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H zone
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Z disc
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M line
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A band
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Explanation:
Detailed explanation-1: -Z-discs (Z-disk, Z-line, Z-band) delineate the lateral borders of sarcomeres and are the smallest functional units in striated muscle. The core of a Z-disc consists of actin filaments coming from adjacent sarcomeres which are crosslinked by actinin molecules [1].
Detailed explanation-2: -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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