Open Question
Suppose a particular neurotransmitter causes an IPSP in postsynaptic cell X and an EPSP in postsynaptic cell Y. A likely explanation is thata. the threshold value in the postsynaptic membrane is 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 activity of the neurotransmitter.d. cells X and Y express different receptor molecules for this particular neurotransmitter.