When a postsynaptic neuron is adequately stimulated, action potentials develop at the initial segment of the axon because :-a- it contains many voltage-gated Na + channelsb- it contains the highest concentration of ligand-gated cation channelsc- it contains many voltage-gated Ca         ++ channelsd- it is more sensitive to the direct stimulant effect of neurotransmitters

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A:

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