A vasoconstrictor whose release triggers action within the sympathetic nervous system, the part of the nervous system that regulates certain involuntary responses during times of stress. Noradrenaline serves as a neurotransmitter that stimulates receptors (alpha- and beta-adrenergic receptors) at effector organs supplied or innervated by certain sympathetic nerve fibers (postganglionic adrenergic fibers). In addition to its production by neurons, noradrenaline is also secreted by the inner region of the adrenal glands (adrenal medulla). The release of noradrenaline serves to deepen breathing, raise blood pressure, and increase the heart rate. It also plays a role in regulating mood.
an adrenal hormone which is a neurotransmitter. It acts at alpha adrenergic receptors. Its main action is to vasoconstrict arterioles and increase blood pressure.
a catecholamine precursor of epinephrine that is secreted by the adrenal medulla and also released at synapses
Transmitter released by most sympathetic nerve terminals. Also called Norepinephrine.
(Norepinephrine): A catecholamine hormone secreted from the adrenal medulla and post-ganglionic adrenergic fibers in response to hypotension or emotional stress.
(also called norepinephrine) a catecholamine hormone with a strongly vasopressive action (constrictive of blood vessels).
(NOR-uh-dreh-nuh-lin) A chemical made by some nerve cells and in the adrenal gland. It can act as both a neurotransmitter (a chemical messenger used by nerve cells) and a hormone (a chemical that travels in the blood and controls the actions of other cells or organs). Noradrenaline is released from the adrenal gland in response to stress and low blood pressure. Also called norepinephrine .