There are no levels: There are no "levels" of neurotransmitters (NTs) in the brain. They don't just float around freely as if in blood. NTs are constantly being dynamically synthesized in neurons, being released into synaptic clefts, & within milliseconds undergoing reuptake either before or after the molecules have been destroyed & recycled into making more NTs. Furthermore, NTs differ depending on the brain region.
Answered 3/4/2018
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