Which Is a TRUE Statement About Excitation-Contraction Coupling

question 58

Multiple Choice

Which is a TRUE statement about excitation-contraction coupling?

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

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