. Suppose a particular neurotransmitter causes an IPSP inpostsynaptic cell X and an EPSP in postsynaptic cell Y. A likelyexplanation is that(A) the threshold value in the postsynaptic membraneis different for cell X and cell Y.(B) the axon of cell X is myelinated, but that of cell Y is not.(C) only cell Y produces an enzyme that terminates the activityof the neurotransmitter.(D) cells X and Y express different receptor molecules for thisparticular neurotransmitter.

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