| Norepinephrine (noradrenaline) is a chemical that acts as both a hormone and as a neurotransmitter (a substance which transmits nerve signals from neuron to neuron). It is produced and secreted by the adrenal glands.
As a hormone, it stimulates the storage or mobilization of sugar by acting on muscle and liver cells.
From the science dictionary at http://biotech.icmb.utexas.edu/
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