Final answer:
Slow removal or inactivation of neurotransmitter molecules from the synapse is important for effective cellular communication.
Step-by-step explanation:
Slow removal or inactivation of neurotransmitter molecules from the synapse is important for effective cellular communication. Once neurotransmission has occurred, the neurotransmitter must be removed from the synaptic cleft so that the postsynaptic membrane can reset and be ready to receive another signal. This removal can be achieved through diffusion, enzymatic degradation, or reuptake by the presynaptic neuron.