Which is a TRUE statement about excitation-contraction coupling?
A. In skeletal muscle cells, it requires the influx of extracellular calcium ion.
B. In skeletal muscle cells, excitation-contraction coupling begins when an action potential propagates along the sarcoplasmic reticulum membrane.
C. Calcium-induced calcium release plays a role in cardiac muscle cells, as well as in some smooth muscle cells.
D. In smooth muscle cells, it must be preceded by an action potential in the cell membrane.
E. In all kinds of muscle it requires the entry of calcium from the extracellular fluid.
Answer: C
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