Specific ways that a drug could increase the effect of a neurotransmitter (nt) at a synapse include: 1) causing the nt to leak out of a synaptic into the synaptic cleft; 2) preventing of the nt by the presynaptic membrane; and, 3) blocking an that normally breaks down the nt.

The given blanks can be filled with vesicle, release, and blocking the action of enzymes.

Explanation:

The psychoactive are the drugs, which instigates the discharge of excitatory neurotransmitter as glutamate, and the antipsychotics diminish the excitation of the neuron. The mentioned drugs could enhance the effect of a neurotransmitter by inducing the leak of neurotransmitter due to the dissociation of a synaptic vesicle, by preventing the release of the neurotransmitter from the presynaptic membrane, and by obstructing the activity of the enzymes that usually breaks down the neurotransmitter.

a polymer is a chainlike molecule made up of small molecular units. these small molecular units are called monomers. monomers of polymer can be joined together either naturally or synthetically.