Neurotransmitters Are Molecules That Cross the Synaptic Cleft and

Multiple Choice

Neurotransmitters are molecules that cross the synaptic cleft and

A) always inhibit the postsynaptic neuron.
B) always excite the postsynaptic neuron.
C) either excite or inhibit the postsynaptic neuron.
D) integrate the pre-synaptic action potential.
E) None of the above.