Answer:
----- Norepinephrine
----- Messenger
Explanation:
Norepinephrine ( NE ), also called noradrenaline ( NA ) or noradrenalin ,
is an organic chemical in the catecholamine family that functions in
the brain and body as a hormone and neurotransmitter.
In the rest of the body, norepinephrine increases heart rate
and blood pressure , triggers the release of glucose from energy
stores, increases blood flow to skeletal muscle , reduces blood flow
to the gastrointestinal system, and inhibits voiding of the bladder
and gastrointestinal motility.
Intracellular
concentrations
of cAMP play an
important
second
messenger role
in regulating
cardiac muscle
contraction.
Activation of the
sympathetic
nervous system
releases the
neurotransmitter
norepinephrine
and increases
circulating catecholamines (epinephrine and norepinephrine).
