Depolarization of a cardiac muscle cell occurs as the result of
A. the closure of the voltage-gated Na+ channels.
B. a decrease in the permeability of the plasma membrane to Na+.
C. the opening of voltage-gated Na+ channels and voltage-gated Ca2+ channels.
D. the opening of voltage-gated K+ channels.
E. the closure of voltage-gated Ca2+ channels.
Answer: C
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