During which of the following phases is K+ permeability greater than at rest?
A. During the after-hyperpolarization phase of an AP
B. During the depolarizating phase of an AP
C. During vesicular release of neurotransmitter from the presynaptic neuron
D. During the repolarizing phase of an AP
E. None of these, K+ permeability is greatest at rest
Answer: D
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