During a synapse, a synaptic vesicle fuses with the presynaptic membrane releasing whatever neurotransmitters it contains. Neurotransmitters are then taken in through transport proteins during re-uptake. Stimulation occurs on a regular basis for some neurons and since the neurotransmitters are not entering through endocytosis, the membrane would just keep building. My thought is that there must be some reliable process that is taking in membrane just as frequently as its added to. Does anyone know what this process is? A cell probably wont just take in membrane, but bring something in with it, what could bring in so regularly?