Some neurotransmitters make it more likely that a neuron will send its message to other neurons, a process known as ; whereas some make it less likely that a neuron will send its message, a process known as .

(A) Excitatory (B) Inhibitory

Explanation:

Excitatory neurotransmitters affect the neuron by showing the excitatory effects. This implies they improve the probability that the neuron will fire an activity potential.   For Example: Acetylcholine, Epinephrine.   Inhibitory neurotransmitters affect the neuron by showing the inhibitory effects. This implies they decline the probability that the neuron will fire an activity. For example: Gamma-aminobutyric acid, Serotonin.Some neurotransmitters , for example, Dopamine,  make both excitatory and inhibitory impacts.