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Certain neurons can repair themselves while others can't. Neurons that can repair themselves are refreed to as white matter. The reason white matter can repair itself is because the axons of white matter are myelinated.
A B After a neurotransmitter molecule has been recognized by a post-synaptic receptor, it is released back into the synaptic cleft. Once in the synapse, it must be quickly removed or chemically inactivated in order to prevent constant stimulation of the post-synaptic cell and an excessive firing of action potentials.Some neurotransmitters are removed from the synaptic cleft by special transporter proteinson the pre-synaptic membrane.europeptide neurotransmitters merely quickly diffuse away from the receptors into the surrounding medium. One important neurotransmitter, acetylcholine, has a specialized enzyme for inactivation right in the synaptic cleft called acetylcholinesterase (AChE.