Depolarization of a cardiac muscle cell occurs as the result of

A. a decrease in the permeability of the cell membrane to sodium.
B. the opening of voltage-gated sodium channels and voltage-gated calcium channels.
C. the closure of voltage-gated calcium channels.
D. the opening of voltage-gated potassium channels.
E. the closure of the voltage-gated sodium channels.


B

Anatomy & Physiology

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