Which best describes a role of L-type Ca2+ channels in cardiac muscle cells?
A. They are responsible for preventing tetanic contractions.
B. They act as non-conducting voltage sensors that mediate excitation-contraction coupling.
C. They are directly responsible for making cardiac muscle fatigue-resistant.
D. They function exactly the same in cardiac muscle cells as they do in skeletal muscle.
E. They cause the absolute refractory period to be very brief.
Answer: A
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