Multiple Choice
In muscle tissue, which type of muscle cell typically has more than one nucleus per cell?
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15. Cytoskeleton and Cell Movement
Muscle Contractions
Multiple Choice
In the context of muscle contractions, which type of muscle cell does not contain myofibrils (and therefore lacks visible sarcomeres/striations)?
A
Skeletal muscle fiber
B
Cardiac muscle cell (cardiomyocyte)
C
Smooth muscle cell
D
Fast-twitch (type II) skeletal muscle fiber
Verified step by step guidance1
Understand that muscle cells can be classified into three main types: skeletal muscle fibers, cardiac muscle cells (cardiomyocytes), and smooth muscle cells.
Recall that skeletal muscle fibers and cardiac muscle cells both contain myofibrils, which are organized into repeating units called sarcomeres, giving them a striated appearance under the microscope.
Recognize that smooth muscle cells lack myofibrils arranged in sarcomeres, so they do not show striations and have a smooth appearance.
Identify that the absence of visible sarcomeres and striations is a defining characteristic of smooth muscle cells, distinguishing them from skeletal and cardiac muscle cells.
Conclude that the muscle cell type without myofibrils and visible sarcomeres/striations is the smooth muscle cell.
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