Which of the following does NOT correctly describe cardiac muscle cells?
A. They are much shorter than skeletal muscle fibers, and generally have a single nucleus.
B. They can contract in the absence of external calcium.
C. Their membranes are depolarized initially by the influx of sodium ions.
D. They depolarize prior to contraction.
E. They are arranged in layers surrounding hollow cavities in the heart.
Answer: B
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