noun. A substance, C₈H₁₁NO₃, both a hormone and neurotransmitter, secreted by the adrenal medulla and the nerve endings of the sympathetic nervous system to cause vasoconstriction and increases in heart rate, blood pressure, and the sugar level of the blood.

noun. A hormone (C8H11NO3) secreted by the adrenal medulla; it also serves as a neurotransmitter, released at synapses; called also noradrenaline. Chemically it is 2-amino-1-(3,4-dihydroxyphenyl)ethanol. It is a precursor of epinephrine in the body.

noun. A neurotransmitter found in the locus coeruleus which is synthesized from dopamine.

noun. a catecholamine precursor of epinephrine that is secreted by the adrenal medulla and also released at synapses

"This result is due to several factors: a direct release of norepinephrine from storage vesicles, the blockage of reuptake of norepinephrine once it has been released into the synaptic cleft and a decrease in norepinephrine metabolism due to inability of MAO to break down norepinephrine."

epinephrine  

catecholamine  monoamine neurotransmitter  phenethylamine  pressor  vasoconstrictive  

5-ht  aldosterone  angiotensin-converting  cholinesterase  cortisol  

noradrenaline  

noradrenaline