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Norepinephrine constricts the arteries, thereby increasing blood pressure.
But what is even more amazing to Peng, is that the release of LHRH is not mediated by any of the mechanisms known to govern the release of neurotransmitters. In every other instance, calcium is required for neurotransmitter release. But for nicotine-induced LHRH release, calcium is totally unnecessary. To explain their baffling results, Peng has turned her attention to glial cells. Researchers recently found that glial cells play more active roles than expected in neuronal information processing.