from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See norepinephrine.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The compound norepinephrine.
from the GNU version of the Collaborative International Dictionary of English
- n. Same as norepinephrine.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a catecholamine precursor of epinephrine that is secreted by the adrenal medulla and also released at synapses
Swedish colleague, the late Nils-Åke Hillarp, he was later able to show that in nerves noradrenaline is synthesized and stored in granules, particles about one ten thousandth of a millimetre in diameter.
Surges of the stress hormone norepinephrine also known as noradrenaline that often accompany strong emotions spark a series of molecular events that ultimately strengthen the connections between neurons, the team reports in the October 5, 2007, issue of the journal Cell, a publication of Cell Press.
Some cardiac researchers believe that very hostile people are prone to developing an anger habit; that is, they fly into rages over even minor annoyances because their bodies become addicted to the chemical norepinephrine, also known as noradrenaline, which the adrenal gland secretes in times of sudden stress.
Not a lot of high-order processing goes on so deep in the brain's basement, but the locus coeruleus does govern the release of the neurotransmitter noradrenaline, which is critical in triggering arousal or alarm, as in the famed fight-or-flight response.
Stress also releases catecholamines such as noradrenaline, which can enlarge the amygdale (structures involved in the processing of fear), also impairing memory and the ability to distinguish a true memory from a false or implanted one.
This can be achieved through meditation exercises or by something as simple as regular power naps, and means the body taps into a different hormone: noradrenaline.
Norepinephrine noradrenaline: produced in the brain stem, this neurotransmitter activates the sympathetic nervous system, setting off the fight-or-flight response, and causes the adrenal glands to produce epinephrine.
Anxiety, anger, or fear causes stress in labor, which produces excessive catecholamines (stress hormones) such as epinephrine (adrenaline) and norepinephrine (noradrenaline).
Dopamine and noradrenaline are important for the prefrontal cortex to function properly, and it is this brain system that allows us to keep our behavior under control.
There is still a great deal of debate about the mechanisms in the brain that cause ADHD, but it's clear that the neurotransmitters, dopamine and noradrenaline are somehow involved.