50. Which one of the following statements is appropriate?
(A) Ca²⁺ channel activation is responsible for the repolarization of cardiac excitable cells.
(B) GABAA receptor is a voltage-gated Clchannel.
(C) Na⁺ channel activation is involved in the initiation of action potential of neurons.
(D) The resting membrane potential of most excitable cells is around 70 mV.

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