28. Which of the following statement about membrane potential and action potential propagation is correct?
(1) The resting potential of a typical neuron is -30 my.
(2) The resting membrane potential of animal neurons depend largely on nongated K+ channels.
(3) During an action potential, opening of voltage-gated Cazt channels happens first.
(4) Repolarization during the refractory period is largely due to opening of voltage-gated K+ channels.
(A) I and 3
(B) 2 and 4
(C) 1,2 and 4
(D) 1, 3 and 4
(E) 2. 3 and 4
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