Which of the following is FASLE regarding cardiac muscle cells: Group of answer choices They have striations like skeletal muscle. They are shorter and more branching than skeletal muscle. They obtain calcium exclusively from the sarcoplasmic reticulum. They possess intercalated discs.
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When compared to skeletal muscle, what differences are observed in cardiac muscle? Cells are fusiform shaped, nonstriated, and contract as a sheet. The force of contraction depends on cell diameter rather than length. Intercalated discs are present and all cells are innervated. The sarcoplasmic reticulum is less complex. Cells are branched and there is a greater abundance of mitochondria. Contraction is triggered by an influx of potassium. The striations are more apparent, and T tubules are more abundant and occur at A-I junctions.
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Cardiac muscle cells and skeletal muscle cells differ in a few ways. Which of the following is not one of them? Cardiac muscle cells lack transverse tubules. Cardiac muscle cells are smaller in size. Cardiac muscle cells have a single, centered nucleus. Cardiac muscle cells branch. Skeletal muscle cells lack intercalated discs.
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Which of the following is a characteristic only of heart muscle cells? - They are striated. - They are multi-nucleated. - They have intercalated disks. - They have a spindle shape. - They are the longest muscle cells.
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