【单选题】In response to binding a neurotransmitter, a postsynaptic cell can
A.
only open chemically gated ion channels, causing graded potentials known as fast synaptic potentials.
B.
only close ion channels via G proteins and second messenger systems, producing slow responses.
C.
only regulate protein synthesis and affect the metabolic activities of the postsynaptic cell.
D.
open chemically gated ion channels, causing graded potentials known as fast synaptic potentials and regulate protein synthesis and affect the metabolic activities of the postsynaptic cell.
E.
open chemically gated ion channels, causing graded potentials known as fast synaptic potentials, close ion channels via G proteins and second messenger systems, producing slow responses, and regulate protein synthesis and affect the metabolic activities of the postsynaptic cell.