PHYSIOLOGY
CARDIAC MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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No Z disks
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Cardiac
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Smooth
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Skeletal
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None of the above
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Explanation:
Detailed explanation-1: -In smooth muscle, actin filaments are attached to the dense bodies on the plasma membrane and within the cytoplasm. These dense bodies are the functional equivalent of Z-disks in skeletal and cardiac muscle.
Detailed explanation-2: -During muscle contraction, each sarcomere shortens, bringing the Z discs closer together. There is no change in the width of the A band, but both the I bands and the H zone almost completely disappear.
Detailed explanation-3: -The skeletal and cardiac muscle isoforms are localized to the sarcomeric Z-discs and are important for actin localization.
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